File: | llvm/lib/Support/VirtualFileSystem.cpp |
Warning: | line 1908, column 51 Potential leak of memory pointed to by 'VFS' |
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1 | //===- VirtualFileSystem.cpp - Virtual File System Layer ------------------===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file implements the VirtualFileSystem interface. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "llvm/Support/VirtualFileSystem.h" | |||
14 | #include "llvm/ADT/ArrayRef.h" | |||
15 | #include "llvm/ADT/DenseMap.h" | |||
16 | #include "llvm/ADT/IntrusiveRefCntPtr.h" | |||
17 | #include "llvm/ADT/None.h" | |||
18 | #include "llvm/ADT/Optional.h" | |||
19 | #include "llvm/ADT/STLExtras.h" | |||
20 | #include "llvm/ADT/SmallString.h" | |||
21 | #include "llvm/ADT/SmallVector.h" | |||
22 | #include "llvm/ADT/StringRef.h" | |||
23 | #include "llvm/ADT/StringSet.h" | |||
24 | #include "llvm/ADT/Twine.h" | |||
25 | #include "llvm/ADT/iterator_range.h" | |||
26 | #include "llvm/Config/llvm-config.h" | |||
27 | #include "llvm/Support/Casting.h" | |||
28 | #include "llvm/Support/Chrono.h" | |||
29 | #include "llvm/Support/Compiler.h" | |||
30 | #include "llvm/Support/Debug.h" | |||
31 | #include "llvm/Support/Errc.h" | |||
32 | #include "llvm/Support/ErrorHandling.h" | |||
33 | #include "llvm/Support/ErrorOr.h" | |||
34 | #include "llvm/Support/FileSystem.h" | |||
35 | #include "llvm/Support/MemoryBuffer.h" | |||
36 | #include "llvm/Support/Path.h" | |||
37 | #include "llvm/Support/Process.h" | |||
38 | #include "llvm/Support/SMLoc.h" | |||
39 | #include "llvm/Support/SourceMgr.h" | |||
40 | #include "llvm/Support/YAMLParser.h" | |||
41 | #include "llvm/Support/raw_ostream.h" | |||
42 | #include <algorithm> | |||
43 | #include <atomic> | |||
44 | #include <cassert> | |||
45 | #include <cstdint> | |||
46 | #include <iterator> | |||
47 | #include <limits> | |||
48 | #include <map> | |||
49 | #include <memory> | |||
50 | #include <mutex> | |||
51 | #include <string> | |||
52 | #include <system_error> | |||
53 | #include <utility> | |||
54 | #include <vector> | |||
55 | ||||
56 | using namespace llvm; | |||
57 | using namespace llvm::vfs; | |||
58 | ||||
59 | using llvm::sys::fs::file_t; | |||
60 | using llvm::sys::fs::file_status; | |||
61 | using llvm::sys::fs::file_type; | |||
62 | using llvm::sys::fs::kInvalidFile; | |||
63 | using llvm::sys::fs::perms; | |||
64 | using llvm::sys::fs::UniqueID; | |||
65 | ||||
66 | Status::Status(const file_status &Status) | |||
67 | : UID(Status.getUniqueID()), MTime(Status.getLastModificationTime()), | |||
68 | User(Status.getUser()), Group(Status.getGroup()), Size(Status.getSize()), | |||
69 | Type(Status.type()), Perms(Status.permissions()) {} | |||
70 | ||||
71 | Status::Status(const Twine &Name, UniqueID UID, sys::TimePoint<> MTime, | |||
72 | uint32_t User, uint32_t Group, uint64_t Size, file_type Type, | |||
73 | perms Perms) | |||
74 | : Name(Name.str()), UID(UID), MTime(MTime), User(User), Group(Group), | |||
75 | Size(Size), Type(Type), Perms(Perms) {} | |||
76 | ||||
77 | Status Status::copyWithNewName(const Status &In, const Twine &NewName) { | |||
78 | return Status(NewName, In.getUniqueID(), In.getLastModificationTime(), | |||
79 | In.getUser(), In.getGroup(), In.getSize(), In.getType(), | |||
80 | In.getPermissions()); | |||
81 | } | |||
82 | ||||
83 | Status Status::copyWithNewName(const file_status &In, const Twine &NewName) { | |||
84 | return Status(NewName, In.getUniqueID(), In.getLastModificationTime(), | |||
85 | In.getUser(), In.getGroup(), In.getSize(), In.type(), | |||
86 | In.permissions()); | |||
87 | } | |||
88 | ||||
89 | bool Status::equivalent(const Status &Other) const { | |||
90 | assert(isStatusKnown() && Other.isStatusKnown())((isStatusKnown() && Other.isStatusKnown()) ? static_cast <void> (0) : __assert_fail ("isStatusKnown() && Other.isStatusKnown()" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 90, __PRETTY_FUNCTION__)); | |||
91 | return getUniqueID() == Other.getUniqueID(); | |||
92 | } | |||
93 | ||||
94 | bool Status::isDirectory() const { return Type == file_type::directory_file; } | |||
95 | ||||
96 | bool Status::isRegularFile() const { return Type == file_type::regular_file; } | |||
97 | ||||
98 | bool Status::isOther() const { | |||
99 | return exists() && !isRegularFile() && !isDirectory() && !isSymlink(); | |||
100 | } | |||
101 | ||||
102 | bool Status::isSymlink() const { return Type == file_type::symlink_file; } | |||
103 | ||||
104 | bool Status::isStatusKnown() const { return Type != file_type::status_error; } | |||
105 | ||||
106 | bool Status::exists() const { | |||
107 | return isStatusKnown() && Type != file_type::file_not_found; | |||
108 | } | |||
109 | ||||
110 | File::~File() = default; | |||
111 | ||||
112 | FileSystem::~FileSystem() = default; | |||
113 | ||||
114 | ErrorOr<std::unique_ptr<MemoryBuffer>> | |||
115 | FileSystem::getBufferForFile(const llvm::Twine &Name, int64_t FileSize, | |||
116 | bool RequiresNullTerminator, bool IsVolatile) { | |||
117 | auto F = openFileForRead(Name); | |||
118 | if (!F) | |||
119 | return F.getError(); | |||
120 | ||||
121 | return (*F)->getBuffer(Name, FileSize, RequiresNullTerminator, IsVolatile); | |||
122 | } | |||
123 | ||||
124 | std::error_code FileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const { | |||
125 | if (llvm::sys::path::is_absolute(Path)) | |||
126 | return {}; | |||
127 | ||||
128 | auto WorkingDir = getCurrentWorkingDirectory(); | |||
129 | if (!WorkingDir) | |||
130 | return WorkingDir.getError(); | |||
131 | ||||
132 | llvm::sys::fs::make_absolute(WorkingDir.get(), Path); | |||
133 | return {}; | |||
134 | } | |||
135 | ||||
136 | std::error_code FileSystem::getRealPath(const Twine &Path, | |||
137 | SmallVectorImpl<char> &Output) const { | |||
138 | return errc::operation_not_permitted; | |||
139 | } | |||
140 | ||||
141 | std::error_code FileSystem::isLocal(const Twine &Path, bool &Result) { | |||
142 | return errc::operation_not_permitted; | |||
143 | } | |||
144 | ||||
145 | bool FileSystem::exists(const Twine &Path) { | |||
146 | auto Status = status(Path); | |||
147 | return Status && Status->exists(); | |||
148 | } | |||
149 | ||||
150 | #ifndef NDEBUG | |||
151 | static bool isTraversalComponent(StringRef Component) { | |||
152 | return Component.equals("..") || Component.equals("."); | |||
153 | } | |||
154 | ||||
155 | static bool pathHasTraversal(StringRef Path) { | |||
156 | using namespace llvm::sys; | |||
157 | ||||
158 | for (StringRef Comp : llvm::make_range(path::begin(Path), path::end(Path))) | |||
159 | if (isTraversalComponent(Comp)) | |||
160 | return true; | |||
161 | return false; | |||
162 | } | |||
163 | #endif | |||
164 | ||||
165 | //===-----------------------------------------------------------------------===/ | |||
166 | // RealFileSystem implementation | |||
167 | //===-----------------------------------------------------------------------===/ | |||
168 | ||||
169 | namespace { | |||
170 | ||||
171 | /// Wrapper around a raw file descriptor. | |||
172 | class RealFile : public File { | |||
173 | friend class RealFileSystem; | |||
174 | ||||
175 | file_t FD; | |||
176 | Status S; | |||
177 | std::string RealName; | |||
178 | ||||
179 | RealFile(file_t RawFD, StringRef NewName, StringRef NewRealPathName) | |||
180 | : FD(RawFD), S(NewName, {}, {}, {}, {}, {}, | |||
181 | llvm::sys::fs::file_type::status_error, {}), | |||
182 | RealName(NewRealPathName.str()) { | |||
183 | assert(FD != kInvalidFile && "Invalid or inactive file descriptor")((FD != kInvalidFile && "Invalid or inactive file descriptor" ) ? static_cast<void> (0) : __assert_fail ("FD != kInvalidFile && \"Invalid or inactive file descriptor\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 183, __PRETTY_FUNCTION__)); | |||
184 | } | |||
185 | ||||
186 | public: | |||
187 | ~RealFile() override; | |||
188 | ||||
189 | ErrorOr<Status> status() override; | |||
190 | ErrorOr<std::string> getName() override; | |||
191 | ErrorOr<std::unique_ptr<MemoryBuffer>> getBuffer(const Twine &Name, | |||
192 | int64_t FileSize, | |||
193 | bool RequiresNullTerminator, | |||
194 | bool IsVolatile) override; | |||
195 | std::error_code close() override; | |||
196 | }; | |||
197 | ||||
198 | } // namespace | |||
199 | ||||
200 | RealFile::~RealFile() { close(); } | |||
201 | ||||
202 | ErrorOr<Status> RealFile::status() { | |||
203 | assert(FD != kInvalidFile && "cannot stat closed file")((FD != kInvalidFile && "cannot stat closed file") ? static_cast <void> (0) : __assert_fail ("FD != kInvalidFile && \"cannot stat closed file\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 203, __PRETTY_FUNCTION__)); | |||
204 | if (!S.isStatusKnown()) { | |||
205 | file_status RealStatus; | |||
206 | if (std::error_code EC = sys::fs::status(FD, RealStatus)) | |||
207 | return EC; | |||
208 | S = Status::copyWithNewName(RealStatus, S.getName()); | |||
209 | } | |||
210 | return S; | |||
211 | } | |||
212 | ||||
213 | ErrorOr<std::string> RealFile::getName() { | |||
214 | return RealName.empty() ? S.getName().str() : RealName; | |||
215 | } | |||
216 | ||||
217 | ErrorOr<std::unique_ptr<MemoryBuffer>> | |||
218 | RealFile::getBuffer(const Twine &Name, int64_t FileSize, | |||
219 | bool RequiresNullTerminator, bool IsVolatile) { | |||
220 | assert(FD != kInvalidFile && "cannot get buffer for closed file")((FD != kInvalidFile && "cannot get buffer for closed file" ) ? static_cast<void> (0) : __assert_fail ("FD != kInvalidFile && \"cannot get buffer for closed file\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 220, __PRETTY_FUNCTION__)); | |||
221 | return MemoryBuffer::getOpenFile(FD, Name, FileSize, RequiresNullTerminator, | |||
222 | IsVolatile); | |||
223 | } | |||
224 | ||||
225 | std::error_code RealFile::close() { | |||
226 | std::error_code EC = sys::fs::closeFile(FD); | |||
227 | FD = kInvalidFile; | |||
228 | return EC; | |||
229 | } | |||
230 | ||||
231 | namespace { | |||
232 | ||||
233 | /// A file system according to your operating system. | |||
234 | /// This may be linked to the process's working directory, or maintain its own. | |||
235 | /// | |||
236 | /// Currently, its own working directory is emulated by storing the path and | |||
237 | /// sending absolute paths to llvm::sys::fs:: functions. | |||
238 | /// A more principled approach would be to push this down a level, modelling | |||
239 | /// the working dir as an llvm::sys::fs::WorkingDir or similar. | |||
240 | /// This would enable the use of openat()-style functions on some platforms. | |||
241 | class RealFileSystem : public FileSystem { | |||
242 | public: | |||
243 | explicit RealFileSystem(bool LinkCWDToProcess) { | |||
244 | if (!LinkCWDToProcess) { | |||
245 | SmallString<128> PWD, RealPWD; | |||
246 | if (llvm::sys::fs::current_path(PWD)) | |||
247 | return; // Awful, but nothing to do here. | |||
248 | if (llvm::sys::fs::real_path(PWD, RealPWD)) | |||
249 | WD = {PWD, PWD}; | |||
250 | else | |||
251 | WD = {PWD, RealPWD}; | |||
252 | } | |||
253 | } | |||
254 | ||||
255 | ErrorOr<Status> status(const Twine &Path) override; | |||
256 | ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override; | |||
257 | directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override; | |||
258 | ||||
259 | llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override; | |||
260 | std::error_code setCurrentWorkingDirectory(const Twine &Path) override; | |||
261 | std::error_code isLocal(const Twine &Path, bool &Result) override; | |||
262 | std::error_code getRealPath(const Twine &Path, | |||
263 | SmallVectorImpl<char> &Output) const override; | |||
264 | ||||
265 | private: | |||
266 | // If this FS has its own working dir, use it to make Path absolute. | |||
267 | // The returned twine is safe to use as long as both Storage and Path live. | |||
268 | Twine adjustPath(const Twine &Path, SmallVectorImpl<char> &Storage) const { | |||
269 | if (!WD) | |||
270 | return Path; | |||
271 | Path.toVector(Storage); | |||
272 | sys::fs::make_absolute(WD->Resolved, Storage); | |||
273 | return Storage; | |||
274 | } | |||
275 | ||||
276 | struct WorkingDirectory { | |||
277 | // The current working directory, without symlinks resolved. (echo $PWD). | |||
278 | SmallString<128> Specified; | |||
279 | // The current working directory, with links resolved. (readlink .). | |||
280 | SmallString<128> Resolved; | |||
281 | }; | |||
282 | Optional<WorkingDirectory> WD; | |||
283 | }; | |||
284 | ||||
285 | } // namespace | |||
286 | ||||
287 | ErrorOr<Status> RealFileSystem::status(const Twine &Path) { | |||
288 | SmallString<256> Storage; | |||
289 | sys::fs::file_status RealStatus; | |||
290 | if (std::error_code EC = | |||
291 | sys::fs::status(adjustPath(Path, Storage), RealStatus)) | |||
292 | return EC; | |||
293 | return Status::copyWithNewName(RealStatus, Path); | |||
294 | } | |||
295 | ||||
296 | ErrorOr<std::unique_ptr<File>> | |||
297 | RealFileSystem::openFileForRead(const Twine &Name) { | |||
298 | SmallString<256> RealName, Storage; | |||
299 | Expected<file_t> FDOrErr = sys::fs::openNativeFileForRead( | |||
300 | adjustPath(Name, Storage), sys::fs::OF_None, &RealName); | |||
301 | if (!FDOrErr) | |||
302 | return errorToErrorCode(FDOrErr.takeError()); | |||
303 | return std::unique_ptr<File>( | |||
304 | new RealFile(*FDOrErr, Name.str(), RealName.str())); | |||
305 | } | |||
306 | ||||
307 | llvm::ErrorOr<std::string> RealFileSystem::getCurrentWorkingDirectory() const { | |||
308 | if (WD) | |||
309 | return std::string(WD->Specified.str()); | |||
310 | ||||
311 | SmallString<128> Dir; | |||
312 | if (std::error_code EC = llvm::sys::fs::current_path(Dir)) | |||
313 | return EC; | |||
314 | return std::string(Dir.str()); | |||
315 | } | |||
316 | ||||
317 | std::error_code RealFileSystem::setCurrentWorkingDirectory(const Twine &Path) { | |||
318 | if (!WD) | |||
319 | return llvm::sys::fs::set_current_path(Path); | |||
320 | ||||
321 | SmallString<128> Absolute, Resolved, Storage; | |||
322 | adjustPath(Path, Storage).toVector(Absolute); | |||
323 | bool IsDir; | |||
324 | if (auto Err = llvm::sys::fs::is_directory(Absolute, IsDir)) | |||
325 | return Err; | |||
326 | if (!IsDir) | |||
327 | return std::make_error_code(std::errc::not_a_directory); | |||
328 | if (auto Err = llvm::sys::fs::real_path(Absolute, Resolved)) | |||
329 | return Err; | |||
330 | WD = {Absolute, Resolved}; | |||
331 | return std::error_code(); | |||
332 | } | |||
333 | ||||
334 | std::error_code RealFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
335 | SmallString<256> Storage; | |||
336 | return llvm::sys::fs::is_local(adjustPath(Path, Storage), Result); | |||
337 | } | |||
338 | ||||
339 | std::error_code | |||
340 | RealFileSystem::getRealPath(const Twine &Path, | |||
341 | SmallVectorImpl<char> &Output) const { | |||
342 | SmallString<256> Storage; | |||
343 | return llvm::sys::fs::real_path(adjustPath(Path, Storage), Output); | |||
344 | } | |||
345 | ||||
346 | IntrusiveRefCntPtr<FileSystem> vfs::getRealFileSystem() { | |||
347 | static IntrusiveRefCntPtr<FileSystem> FS(new RealFileSystem(true)); | |||
348 | return FS; | |||
349 | } | |||
350 | ||||
351 | std::unique_ptr<FileSystem> vfs::createPhysicalFileSystem() { | |||
352 | return std::make_unique<RealFileSystem>(false); | |||
353 | } | |||
354 | ||||
355 | namespace { | |||
356 | ||||
357 | class RealFSDirIter : public llvm::vfs::detail::DirIterImpl { | |||
358 | llvm::sys::fs::directory_iterator Iter; | |||
359 | ||||
360 | public: | |||
361 | RealFSDirIter(const Twine &Path, std::error_code &EC) : Iter(Path, EC) { | |||
362 | if (Iter != llvm::sys::fs::directory_iterator()) | |||
363 | CurrentEntry = directory_entry(Iter->path(), Iter->type()); | |||
364 | } | |||
365 | ||||
366 | std::error_code increment() override { | |||
367 | std::error_code EC; | |||
368 | Iter.increment(EC); | |||
369 | CurrentEntry = (Iter == llvm::sys::fs::directory_iterator()) | |||
370 | ? directory_entry() | |||
371 | : directory_entry(Iter->path(), Iter->type()); | |||
372 | return EC; | |||
373 | } | |||
374 | }; | |||
375 | ||||
376 | } // namespace | |||
377 | ||||
378 | directory_iterator RealFileSystem::dir_begin(const Twine &Dir, | |||
379 | std::error_code &EC) { | |||
380 | SmallString<128> Storage; | |||
381 | return directory_iterator( | |||
382 | std::make_shared<RealFSDirIter>(adjustPath(Dir, Storage), EC)); | |||
383 | } | |||
384 | ||||
385 | //===-----------------------------------------------------------------------===/ | |||
386 | // OverlayFileSystem implementation | |||
387 | //===-----------------------------------------------------------------------===/ | |||
388 | ||||
389 | OverlayFileSystem::OverlayFileSystem(IntrusiveRefCntPtr<FileSystem> BaseFS) { | |||
390 | FSList.push_back(std::move(BaseFS)); | |||
391 | } | |||
392 | ||||
393 | void OverlayFileSystem::pushOverlay(IntrusiveRefCntPtr<FileSystem> FS) { | |||
394 | FSList.push_back(FS); | |||
395 | // Synchronize added file systems by duplicating the working directory from | |||
396 | // the first one in the list. | |||
397 | FS->setCurrentWorkingDirectory(getCurrentWorkingDirectory().get()); | |||
398 | } | |||
399 | ||||
400 | ErrorOr<Status> OverlayFileSystem::status(const Twine &Path) { | |||
401 | // FIXME: handle symlinks that cross file systems | |||
402 | for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) { | |||
403 | ErrorOr<Status> Status = (*I)->status(Path); | |||
404 | if (Status || Status.getError() != llvm::errc::no_such_file_or_directory) | |||
405 | return Status; | |||
406 | } | |||
407 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
408 | } | |||
409 | ||||
410 | ErrorOr<std::unique_ptr<File>> | |||
411 | OverlayFileSystem::openFileForRead(const llvm::Twine &Path) { | |||
412 | // FIXME: handle symlinks that cross file systems | |||
413 | for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) { | |||
414 | auto Result = (*I)->openFileForRead(Path); | |||
415 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
416 | return Result; | |||
417 | } | |||
418 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
419 | } | |||
420 | ||||
421 | llvm::ErrorOr<std::string> | |||
422 | OverlayFileSystem::getCurrentWorkingDirectory() const { | |||
423 | // All file systems are synchronized, just take the first working directory. | |||
424 | return FSList.front()->getCurrentWorkingDirectory(); | |||
425 | } | |||
426 | ||||
427 | std::error_code | |||
428 | OverlayFileSystem::setCurrentWorkingDirectory(const Twine &Path) { | |||
429 | for (auto &FS : FSList) | |||
430 | if (std::error_code EC = FS->setCurrentWorkingDirectory(Path)) | |||
431 | return EC; | |||
432 | return {}; | |||
433 | } | |||
434 | ||||
435 | std::error_code OverlayFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
436 | for (auto &FS : FSList) | |||
437 | if (FS->exists(Path)) | |||
438 | return FS->isLocal(Path, Result); | |||
439 | return errc::no_such_file_or_directory; | |||
440 | } | |||
441 | ||||
442 | std::error_code | |||
443 | OverlayFileSystem::getRealPath(const Twine &Path, | |||
444 | SmallVectorImpl<char> &Output) const { | |||
445 | for (auto &FS : FSList) | |||
446 | if (FS->exists(Path)) | |||
447 | return FS->getRealPath(Path, Output); | |||
448 | return errc::no_such_file_or_directory; | |||
449 | } | |||
450 | ||||
451 | llvm::vfs::detail::DirIterImpl::~DirIterImpl() = default; | |||
452 | ||||
453 | namespace { | |||
454 | ||||
455 | class OverlayFSDirIterImpl : public llvm::vfs::detail::DirIterImpl { | |||
456 | OverlayFileSystem &Overlays; | |||
457 | std::string Path; | |||
458 | OverlayFileSystem::iterator CurrentFS; | |||
459 | directory_iterator CurrentDirIter; | |||
460 | llvm::StringSet<> SeenNames; | |||
461 | ||||
462 | std::error_code incrementFS() { | |||
463 | assert(CurrentFS != Overlays.overlays_end() && "incrementing past end")((CurrentFS != Overlays.overlays_end() && "incrementing past end" ) ? static_cast<void> (0) : __assert_fail ("CurrentFS != Overlays.overlays_end() && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 463, __PRETTY_FUNCTION__)); | |||
464 | ++CurrentFS; | |||
465 | for (auto E = Overlays.overlays_end(); CurrentFS != E; ++CurrentFS) { | |||
466 | std::error_code EC; | |||
467 | CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC); | |||
468 | if (EC && EC != errc::no_such_file_or_directory) | |||
469 | return EC; | |||
470 | if (CurrentDirIter != directory_iterator()) | |||
471 | break; // found | |||
472 | } | |||
473 | return {}; | |||
474 | } | |||
475 | ||||
476 | std::error_code incrementDirIter(bool IsFirstTime) { | |||
477 | assert((IsFirstTime || CurrentDirIter != directory_iterator()) &&(((IsFirstTime || CurrentDirIter != directory_iterator()) && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || CurrentDirIter != directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 478, __PRETTY_FUNCTION__)) | |||
478 | "incrementing past end")(((IsFirstTime || CurrentDirIter != directory_iterator()) && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || CurrentDirIter != directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 478, __PRETTY_FUNCTION__)); | |||
479 | std::error_code EC; | |||
480 | if (!IsFirstTime) | |||
481 | CurrentDirIter.increment(EC); | |||
482 | if (!EC && CurrentDirIter == directory_iterator()) | |||
483 | EC = incrementFS(); | |||
484 | return EC; | |||
485 | } | |||
486 | ||||
487 | std::error_code incrementImpl(bool IsFirstTime) { | |||
488 | while (true) { | |||
489 | std::error_code EC = incrementDirIter(IsFirstTime); | |||
490 | if (EC || CurrentDirIter == directory_iterator()) { | |||
491 | CurrentEntry = directory_entry(); | |||
492 | return EC; | |||
493 | } | |||
494 | CurrentEntry = *CurrentDirIter; | |||
495 | StringRef Name = llvm::sys::path::filename(CurrentEntry.path()); | |||
496 | if (SeenNames.insert(Name).second) | |||
497 | return EC; // name not seen before | |||
498 | } | |||
499 | llvm_unreachable("returned above")::llvm::llvm_unreachable_internal("returned above", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 499); | |||
500 | } | |||
501 | ||||
502 | public: | |||
503 | OverlayFSDirIterImpl(const Twine &Path, OverlayFileSystem &FS, | |||
504 | std::error_code &EC) | |||
505 | : Overlays(FS), Path(Path.str()), CurrentFS(Overlays.overlays_begin()) { | |||
506 | CurrentDirIter = (*CurrentFS)->dir_begin(Path, EC); | |||
507 | EC = incrementImpl(true); | |||
508 | } | |||
509 | ||||
510 | std::error_code increment() override { return incrementImpl(false); } | |||
511 | }; | |||
512 | ||||
513 | } // namespace | |||
514 | ||||
515 | directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir, | |||
516 | std::error_code &EC) { | |||
517 | return directory_iterator( | |||
518 | std::make_shared<OverlayFSDirIterImpl>(Dir, *this, EC)); | |||
519 | } | |||
520 | ||||
521 | void ProxyFileSystem::anchor() {} | |||
522 | ||||
523 | namespace llvm { | |||
524 | namespace vfs { | |||
525 | ||||
526 | namespace detail { | |||
527 | ||||
528 | enum InMemoryNodeKind { IME_File, IME_Directory, IME_HardLink }; | |||
529 | ||||
530 | /// The in memory file system is a tree of Nodes. Every node can either be a | |||
531 | /// file , hardlink or a directory. | |||
532 | class InMemoryNode { | |||
533 | InMemoryNodeKind Kind; | |||
534 | std::string FileName; | |||
535 | ||||
536 | public: | |||
537 | InMemoryNode(llvm::StringRef FileName, InMemoryNodeKind Kind) | |||
538 | : Kind(Kind), FileName(std::string(llvm::sys::path::filename(FileName))) { | |||
539 | } | |||
540 | virtual ~InMemoryNode() = default; | |||
541 | ||||
542 | /// Get the filename of this node (the name without the directory part). | |||
543 | StringRef getFileName() const { return FileName; } | |||
544 | InMemoryNodeKind getKind() const { return Kind; } | |||
545 | virtual std::string toString(unsigned Indent) const = 0; | |||
546 | }; | |||
547 | ||||
548 | class InMemoryFile : public InMemoryNode { | |||
549 | Status Stat; | |||
550 | std::unique_ptr<llvm::MemoryBuffer> Buffer; | |||
551 | ||||
552 | public: | |||
553 | InMemoryFile(Status Stat, std::unique_ptr<llvm::MemoryBuffer> Buffer) | |||
554 | : InMemoryNode(Stat.getName(), IME_File), Stat(std::move(Stat)), | |||
555 | Buffer(std::move(Buffer)) {} | |||
556 | ||||
557 | /// Return the \p Status for this node. \p RequestedName should be the name | |||
558 | /// through which the caller referred to this node. It will override | |||
559 | /// \p Status::Name in the return value, to mimic the behavior of \p RealFile. | |||
560 | Status getStatus(const Twine &RequestedName) const { | |||
561 | return Status::copyWithNewName(Stat, RequestedName); | |||
562 | } | |||
563 | llvm::MemoryBuffer *getBuffer() const { return Buffer.get(); } | |||
564 | ||||
565 | std::string toString(unsigned Indent) const override { | |||
566 | return (std::string(Indent, ' ') + Stat.getName() + "\n").str(); | |||
567 | } | |||
568 | ||||
569 | static bool classof(const InMemoryNode *N) { | |||
570 | return N->getKind() == IME_File; | |||
571 | } | |||
572 | }; | |||
573 | ||||
574 | namespace { | |||
575 | ||||
576 | class InMemoryHardLink : public InMemoryNode { | |||
577 | const InMemoryFile &ResolvedFile; | |||
578 | ||||
579 | public: | |||
580 | InMemoryHardLink(StringRef Path, const InMemoryFile &ResolvedFile) | |||
581 | : InMemoryNode(Path, IME_HardLink), ResolvedFile(ResolvedFile) {} | |||
582 | const InMemoryFile &getResolvedFile() const { return ResolvedFile; } | |||
583 | ||||
584 | std::string toString(unsigned Indent) const override { | |||
585 | return std::string(Indent, ' ') + "HardLink to -> " + | |||
586 | ResolvedFile.toString(0); | |||
587 | } | |||
588 | ||||
589 | static bool classof(const InMemoryNode *N) { | |||
590 | return N->getKind() == IME_HardLink; | |||
591 | } | |||
592 | }; | |||
593 | ||||
594 | /// Adapt a InMemoryFile for VFS' File interface. The goal is to make | |||
595 | /// \p InMemoryFileAdaptor mimic as much as possible the behavior of | |||
596 | /// \p RealFile. | |||
597 | class InMemoryFileAdaptor : public File { | |||
598 | const InMemoryFile &Node; | |||
599 | /// The name to use when returning a Status for this file. | |||
600 | std::string RequestedName; | |||
601 | ||||
602 | public: | |||
603 | explicit InMemoryFileAdaptor(const InMemoryFile &Node, | |||
604 | std::string RequestedName) | |||
605 | : Node(Node), RequestedName(std::move(RequestedName)) {} | |||
606 | ||||
607 | llvm::ErrorOr<Status> status() override { | |||
608 | return Node.getStatus(RequestedName); | |||
609 | } | |||
610 | ||||
611 | llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> | |||
612 | getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator, | |||
613 | bool IsVolatile) override { | |||
614 | llvm::MemoryBuffer *Buf = Node.getBuffer(); | |||
615 | return llvm::MemoryBuffer::getMemBuffer( | |||
616 | Buf->getBuffer(), Buf->getBufferIdentifier(), RequiresNullTerminator); | |||
617 | } | |||
618 | ||||
619 | std::error_code close() override { return {}; } | |||
620 | }; | |||
621 | } // namespace | |||
622 | ||||
623 | class InMemoryDirectory : public InMemoryNode { | |||
624 | Status Stat; | |||
625 | llvm::StringMap<std::unique_ptr<InMemoryNode>> Entries; | |||
626 | ||||
627 | public: | |||
628 | InMemoryDirectory(Status Stat) | |||
629 | : InMemoryNode(Stat.getName(), IME_Directory), Stat(std::move(Stat)) {} | |||
630 | ||||
631 | /// Return the \p Status for this node. \p RequestedName should be the name | |||
632 | /// through which the caller referred to this node. It will override | |||
633 | /// \p Status::Name in the return value, to mimic the behavior of \p RealFile. | |||
634 | Status getStatus(const Twine &RequestedName) const { | |||
635 | return Status::copyWithNewName(Stat, RequestedName); | |||
636 | } | |||
637 | InMemoryNode *getChild(StringRef Name) { | |||
638 | auto I = Entries.find(Name); | |||
639 | if (I != Entries.end()) | |||
640 | return I->second.get(); | |||
641 | return nullptr; | |||
642 | } | |||
643 | ||||
644 | InMemoryNode *addChild(StringRef Name, std::unique_ptr<InMemoryNode> Child) { | |||
645 | return Entries.insert(make_pair(Name, std::move(Child))) | |||
646 | .first->second.get(); | |||
647 | } | |||
648 | ||||
649 | using const_iterator = decltype(Entries)::const_iterator; | |||
650 | ||||
651 | const_iterator begin() const { return Entries.begin(); } | |||
652 | const_iterator end() const { return Entries.end(); } | |||
653 | ||||
654 | std::string toString(unsigned Indent) const override { | |||
655 | std::string Result = | |||
656 | (std::string(Indent, ' ') + Stat.getName() + "\n").str(); | |||
657 | for (const auto &Entry : Entries) | |||
658 | Result += Entry.second->toString(Indent + 2); | |||
659 | return Result; | |||
660 | } | |||
661 | ||||
662 | static bool classof(const InMemoryNode *N) { | |||
663 | return N->getKind() == IME_Directory; | |||
664 | } | |||
665 | }; | |||
666 | ||||
667 | namespace { | |||
668 | Status getNodeStatus(const InMemoryNode *Node, const Twine &RequestedName) { | |||
669 | if (auto Dir = dyn_cast<detail::InMemoryDirectory>(Node)) | |||
670 | return Dir->getStatus(RequestedName); | |||
671 | if (auto File = dyn_cast<detail::InMemoryFile>(Node)) | |||
672 | return File->getStatus(RequestedName); | |||
673 | if (auto Link = dyn_cast<detail::InMemoryHardLink>(Node)) | |||
674 | return Link->getResolvedFile().getStatus(RequestedName); | |||
675 | llvm_unreachable("Unknown node type")::llvm::llvm_unreachable_internal("Unknown node type", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 675); | |||
676 | } | |||
677 | } // namespace | |||
678 | } // namespace detail | |||
679 | ||||
680 | InMemoryFileSystem::InMemoryFileSystem(bool UseNormalizedPaths) | |||
681 | : Root(new detail::InMemoryDirectory( | |||
682 | Status("", getNextVirtualUniqueID(), llvm::sys::TimePoint<>(), 0, 0, | |||
683 | 0, llvm::sys::fs::file_type::directory_file, | |||
684 | llvm::sys::fs::perms::all_all))), | |||
685 | UseNormalizedPaths(UseNormalizedPaths) {} | |||
686 | ||||
687 | InMemoryFileSystem::~InMemoryFileSystem() = default; | |||
688 | ||||
689 | std::string InMemoryFileSystem::toString() const { | |||
690 | return Root->toString(/*Indent=*/0); | |||
691 | } | |||
692 | ||||
693 | bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime, | |||
694 | std::unique_ptr<llvm::MemoryBuffer> Buffer, | |||
695 | Optional<uint32_t> User, | |||
696 | Optional<uint32_t> Group, | |||
697 | Optional<llvm::sys::fs::file_type> Type, | |||
698 | Optional<llvm::sys::fs::perms> Perms, | |||
699 | const detail::InMemoryFile *HardLinkTarget) { | |||
700 | SmallString<128> Path; | |||
701 | P.toVector(Path); | |||
702 | ||||
703 | // Fix up relative paths. This just prepends the current working directory. | |||
704 | std::error_code EC = makeAbsolute(Path); | |||
705 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 705, __PRETTY_FUNCTION__)); | |||
706 | (void)EC; | |||
707 | ||||
708 | if (useNormalizedPaths()) | |||
709 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
710 | ||||
711 | if (Path.empty()) | |||
712 | return false; | |||
713 | ||||
714 | detail::InMemoryDirectory *Dir = Root.get(); | |||
715 | auto I = llvm::sys::path::begin(Path), E = sys::path::end(Path); | |||
716 | const auto ResolvedUser = User.getValueOr(0); | |||
717 | const auto ResolvedGroup = Group.getValueOr(0); | |||
718 | const auto ResolvedType = Type.getValueOr(sys::fs::file_type::regular_file); | |||
719 | const auto ResolvedPerms = Perms.getValueOr(sys::fs::all_all); | |||
720 | assert(!(HardLinkTarget && Buffer) && "HardLink cannot have a buffer")((!(HardLinkTarget && Buffer) && "HardLink cannot have a buffer" ) ? static_cast<void> (0) : __assert_fail ("!(HardLinkTarget && Buffer) && \"HardLink cannot have a buffer\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 720, __PRETTY_FUNCTION__)); | |||
721 | // Any intermediate directories we create should be accessible by | |||
722 | // the owner, even if Perms says otherwise for the final path. | |||
723 | const auto NewDirectoryPerms = ResolvedPerms | sys::fs::owner_all; | |||
724 | while (true) { | |||
725 | StringRef Name = *I; | |||
726 | detail::InMemoryNode *Node = Dir->getChild(Name); | |||
727 | ++I; | |||
728 | if (!Node) { | |||
729 | if (I == E) { | |||
730 | // End of the path. | |||
731 | std::unique_ptr<detail::InMemoryNode> Child; | |||
732 | if (HardLinkTarget) | |||
733 | Child.reset(new detail::InMemoryHardLink(P.str(), *HardLinkTarget)); | |||
734 | else { | |||
735 | // Create a new file or directory. | |||
736 | Status Stat(P.str(), getNextVirtualUniqueID(), | |||
737 | llvm::sys::toTimePoint(ModificationTime), ResolvedUser, | |||
738 | ResolvedGroup, Buffer->getBufferSize(), ResolvedType, | |||
739 | ResolvedPerms); | |||
740 | if (ResolvedType == sys::fs::file_type::directory_file) { | |||
741 | Child.reset(new detail::InMemoryDirectory(std::move(Stat))); | |||
742 | } else { | |||
743 | Child.reset( | |||
744 | new detail::InMemoryFile(std::move(Stat), std::move(Buffer))); | |||
745 | } | |||
746 | } | |||
747 | Dir->addChild(Name, std::move(Child)); | |||
748 | return true; | |||
749 | } | |||
750 | ||||
751 | // Create a new directory. Use the path up to here. | |||
752 | Status Stat( | |||
753 | StringRef(Path.str().begin(), Name.end() - Path.str().begin()), | |||
754 | getNextVirtualUniqueID(), llvm::sys::toTimePoint(ModificationTime), | |||
755 | ResolvedUser, ResolvedGroup, 0, sys::fs::file_type::directory_file, | |||
756 | NewDirectoryPerms); | |||
757 | Dir = cast<detail::InMemoryDirectory>(Dir->addChild( | |||
758 | Name, std::make_unique<detail::InMemoryDirectory>(std::move(Stat)))); | |||
759 | continue; | |||
760 | } | |||
761 | ||||
762 | if (auto *NewDir = dyn_cast<detail::InMemoryDirectory>(Node)) { | |||
763 | Dir = NewDir; | |||
764 | } else { | |||
765 | assert((isa<detail::InMemoryFile>(Node) ||(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 767, __PRETTY_FUNCTION__)) | |||
766 | isa<detail::InMemoryHardLink>(Node)) &&(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 767, __PRETTY_FUNCTION__)) | |||
767 | "Must be either file, hardlink or directory!")(((isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink >(Node)) && "Must be either file, hardlink or directory!" ) ? static_cast<void> (0) : __assert_fail ("(isa<detail::InMemoryFile>(Node) || isa<detail::InMemoryHardLink>(Node)) && \"Must be either file, hardlink or directory!\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 767, __PRETTY_FUNCTION__)); | |||
768 | ||||
769 | // Trying to insert a directory in place of a file. | |||
770 | if (I != E) | |||
771 | return false; | |||
772 | ||||
773 | // Return false only if the new file is different from the existing one. | |||
774 | if (auto Link = dyn_cast<detail::InMemoryHardLink>(Node)) { | |||
775 | return Link->getResolvedFile().getBuffer()->getBuffer() == | |||
776 | Buffer->getBuffer(); | |||
777 | } | |||
778 | return cast<detail::InMemoryFile>(Node)->getBuffer()->getBuffer() == | |||
779 | Buffer->getBuffer(); | |||
780 | } | |||
781 | } | |||
782 | } | |||
783 | ||||
784 | bool InMemoryFileSystem::addFile(const Twine &P, time_t ModificationTime, | |||
785 | std::unique_ptr<llvm::MemoryBuffer> Buffer, | |||
786 | Optional<uint32_t> User, | |||
787 | Optional<uint32_t> Group, | |||
788 | Optional<llvm::sys::fs::file_type> Type, | |||
789 | Optional<llvm::sys::fs::perms> Perms) { | |||
790 | return addFile(P, ModificationTime, std::move(Buffer), User, Group, Type, | |||
791 | Perms, /*HardLinkTarget=*/nullptr); | |||
792 | } | |||
793 | ||||
794 | bool InMemoryFileSystem::addFileNoOwn(const Twine &P, time_t ModificationTime, | |||
795 | const llvm::MemoryBufferRef &Buffer, | |||
796 | Optional<uint32_t> User, | |||
797 | Optional<uint32_t> Group, | |||
798 | Optional<llvm::sys::fs::file_type> Type, | |||
799 | Optional<llvm::sys::fs::perms> Perms) { | |||
800 | return addFile(P, ModificationTime, llvm::MemoryBuffer::getMemBuffer(Buffer), | |||
801 | std::move(User), std::move(Group), std::move(Type), | |||
802 | std::move(Perms)); | |||
803 | } | |||
804 | ||||
805 | static ErrorOr<const detail::InMemoryNode *> | |||
806 | lookupInMemoryNode(const InMemoryFileSystem &FS, detail::InMemoryDirectory *Dir, | |||
807 | const Twine &P) { | |||
808 | SmallString<128> Path; | |||
809 | P.toVector(Path); | |||
810 | ||||
811 | // Fix up relative paths. This just prepends the current working directory. | |||
812 | std::error_code EC = FS.makeAbsolute(Path); | |||
813 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 813, __PRETTY_FUNCTION__)); | |||
814 | (void)EC; | |||
815 | ||||
816 | if (FS.useNormalizedPaths()) | |||
817 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
818 | ||||
819 | if (Path.empty()) | |||
820 | return Dir; | |||
821 | ||||
822 | auto I = llvm::sys::path::begin(Path), E = llvm::sys::path::end(Path); | |||
823 | while (true) { | |||
824 | detail::InMemoryNode *Node = Dir->getChild(*I); | |||
825 | ++I; | |||
826 | if (!Node) | |||
827 | return errc::no_such_file_or_directory; | |||
828 | ||||
829 | // Return the file if it's at the end of the path. | |||
830 | if (auto File = dyn_cast<detail::InMemoryFile>(Node)) { | |||
831 | if (I == E) | |||
832 | return File; | |||
833 | return errc::no_such_file_or_directory; | |||
834 | } | |||
835 | ||||
836 | // If Node is HardLink then return the resolved file. | |||
837 | if (auto File = dyn_cast<detail::InMemoryHardLink>(Node)) { | |||
838 | if (I == E) | |||
839 | return &File->getResolvedFile(); | |||
840 | return errc::no_such_file_or_directory; | |||
841 | } | |||
842 | // Traverse directories. | |||
843 | Dir = cast<detail::InMemoryDirectory>(Node); | |||
844 | if (I == E) | |||
845 | return Dir; | |||
846 | } | |||
847 | } | |||
848 | ||||
849 | bool InMemoryFileSystem::addHardLink(const Twine &FromPath, | |||
850 | const Twine &ToPath) { | |||
851 | auto FromNode = lookupInMemoryNode(*this, Root.get(), FromPath); | |||
852 | auto ToNode = lookupInMemoryNode(*this, Root.get(), ToPath); | |||
853 | // FromPath must not have been added before. ToPath must have been added | |||
854 | // before. Resolved ToPath must be a File. | |||
855 | if (!ToNode || FromNode || !isa<detail::InMemoryFile>(*ToNode)) | |||
856 | return false; | |||
857 | return this->addFile(FromPath, 0, nullptr, None, None, None, None, | |||
858 | cast<detail::InMemoryFile>(*ToNode)); | |||
859 | } | |||
860 | ||||
861 | llvm::ErrorOr<Status> InMemoryFileSystem::status(const Twine &Path) { | |||
862 | auto Node = lookupInMemoryNode(*this, Root.get(), Path); | |||
863 | if (Node) | |||
864 | return detail::getNodeStatus(*Node, Path); | |||
865 | return Node.getError(); | |||
866 | } | |||
867 | ||||
868 | llvm::ErrorOr<std::unique_ptr<File>> | |||
869 | InMemoryFileSystem::openFileForRead(const Twine &Path) { | |||
870 | auto Node = lookupInMemoryNode(*this, Root.get(), Path); | |||
871 | if (!Node) | |||
872 | return Node.getError(); | |||
873 | ||||
874 | // When we have a file provide a heap-allocated wrapper for the memory buffer | |||
875 | // to match the ownership semantics for File. | |||
876 | if (auto *F = dyn_cast<detail::InMemoryFile>(*Node)) | |||
877 | return std::unique_ptr<File>( | |||
878 | new detail::InMemoryFileAdaptor(*F, Path.str())); | |||
879 | ||||
880 | // FIXME: errc::not_a_file? | |||
881 | return make_error_code(llvm::errc::invalid_argument); | |||
882 | } | |||
883 | ||||
884 | namespace { | |||
885 | ||||
886 | /// Adaptor from InMemoryDir::iterator to directory_iterator. | |||
887 | class InMemoryDirIterator : public llvm::vfs::detail::DirIterImpl { | |||
888 | detail::InMemoryDirectory::const_iterator I; | |||
889 | detail::InMemoryDirectory::const_iterator E; | |||
890 | std::string RequestedDirName; | |||
891 | ||||
892 | void setCurrentEntry() { | |||
893 | if (I != E) { | |||
894 | SmallString<256> Path(RequestedDirName); | |||
895 | llvm::sys::path::append(Path, I->second->getFileName()); | |||
896 | sys::fs::file_type Type = sys::fs::file_type::type_unknown; | |||
897 | switch (I->second->getKind()) { | |||
898 | case detail::IME_File: | |||
899 | case detail::IME_HardLink: | |||
900 | Type = sys::fs::file_type::regular_file; | |||
901 | break; | |||
902 | case detail::IME_Directory: | |||
903 | Type = sys::fs::file_type::directory_file; | |||
904 | break; | |||
905 | } | |||
906 | CurrentEntry = directory_entry(std::string(Path.str()), Type); | |||
907 | } else { | |||
908 | // When we're at the end, make CurrentEntry invalid and DirIterImpl will | |||
909 | // do the rest. | |||
910 | CurrentEntry = directory_entry(); | |||
911 | } | |||
912 | } | |||
913 | ||||
914 | public: | |||
915 | InMemoryDirIterator() = default; | |||
916 | ||||
917 | explicit InMemoryDirIterator(const detail::InMemoryDirectory &Dir, | |||
918 | std::string RequestedDirName) | |||
919 | : I(Dir.begin()), E(Dir.end()), | |||
920 | RequestedDirName(std::move(RequestedDirName)) { | |||
921 | setCurrentEntry(); | |||
922 | } | |||
923 | ||||
924 | std::error_code increment() override { | |||
925 | ++I; | |||
926 | setCurrentEntry(); | |||
927 | return {}; | |||
928 | } | |||
929 | }; | |||
930 | ||||
931 | } // namespace | |||
932 | ||||
933 | directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir, | |||
934 | std::error_code &EC) { | |||
935 | auto Node = lookupInMemoryNode(*this, Root.get(), Dir); | |||
936 | if (!Node) { | |||
937 | EC = Node.getError(); | |||
938 | return directory_iterator(std::make_shared<InMemoryDirIterator>()); | |||
939 | } | |||
940 | ||||
941 | if (auto *DirNode = dyn_cast<detail::InMemoryDirectory>(*Node)) | |||
942 | return directory_iterator( | |||
943 | std::make_shared<InMemoryDirIterator>(*DirNode, Dir.str())); | |||
944 | ||||
945 | EC = make_error_code(llvm::errc::not_a_directory); | |||
946 | return directory_iterator(std::make_shared<InMemoryDirIterator>()); | |||
947 | } | |||
948 | ||||
949 | std::error_code InMemoryFileSystem::setCurrentWorkingDirectory(const Twine &P) { | |||
950 | SmallString<128> Path; | |||
951 | P.toVector(Path); | |||
952 | ||||
953 | // Fix up relative paths. This just prepends the current working directory. | |||
954 | std::error_code EC = makeAbsolute(Path); | |||
955 | assert(!EC)((!EC) ? static_cast<void> (0) : __assert_fail ("!EC", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 955, __PRETTY_FUNCTION__)); | |||
956 | (void)EC; | |||
957 | ||||
958 | if (useNormalizedPaths()) | |||
959 | llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true); | |||
960 | ||||
961 | if (!Path.empty()) | |||
962 | WorkingDirectory = std::string(Path.str()); | |||
963 | return {}; | |||
964 | } | |||
965 | ||||
966 | std::error_code | |||
967 | InMemoryFileSystem::getRealPath(const Twine &Path, | |||
968 | SmallVectorImpl<char> &Output) const { | |||
969 | auto CWD = getCurrentWorkingDirectory(); | |||
970 | if (!CWD || CWD->empty()) | |||
971 | return errc::operation_not_permitted; | |||
972 | Path.toVector(Output); | |||
973 | if (auto EC = makeAbsolute(Output)) | |||
974 | return EC; | |||
975 | llvm::sys::path::remove_dots(Output, /*remove_dot_dot=*/true); | |||
976 | return {}; | |||
977 | } | |||
978 | ||||
979 | std::error_code InMemoryFileSystem::isLocal(const Twine &Path, bool &Result) { | |||
980 | Result = false; | |||
981 | return {}; | |||
982 | } | |||
983 | ||||
984 | } // namespace vfs | |||
985 | } // namespace llvm | |||
986 | ||||
987 | //===-----------------------------------------------------------------------===/ | |||
988 | // RedirectingFileSystem implementation | |||
989 | //===-----------------------------------------------------------------------===/ | |||
990 | ||||
991 | namespace { | |||
992 | ||||
993 | /// Removes leading "./" as well as path components like ".." and ".". | |||
994 | static llvm::SmallString<256> canonicalize(llvm::StringRef Path) { | |||
995 | // First detect the path style in use by checking the first separator. | |||
996 | llvm::sys::path::Style style = llvm::sys::path::Style::native; | |||
997 | const size_t n = Path.find_first_of("/\\"); | |||
998 | if (n != static_cast<size_t>(-1)) | |||
999 | style = (Path[n] == '/') ? llvm::sys::path::Style::posix | |||
1000 | : llvm::sys::path::Style::windows; | |||
1001 | ||||
1002 | // Now remove the dots. Explicitly specifying the path style prevents the | |||
1003 | // direction of the slashes from changing. | |||
1004 | llvm::SmallString<256> result = | |||
1005 | llvm::sys::path::remove_leading_dotslash(Path, style); | |||
1006 | llvm::sys::path::remove_dots(result, /*remove_dot_dot=*/true, style); | |||
1007 | return result; | |||
1008 | } | |||
1009 | ||||
1010 | } // anonymous namespace | |||
1011 | ||||
1012 | ||||
1013 | RedirectingFileSystem::RedirectingFileSystem(IntrusiveRefCntPtr<FileSystem> FS) | |||
1014 | : ExternalFS(std::move(FS)) { | |||
1015 | if (ExternalFS) | |||
1016 | if (auto ExternalWorkingDirectory = | |||
1017 | ExternalFS->getCurrentWorkingDirectory()) { | |||
1018 | WorkingDirectory = *ExternalWorkingDirectory; | |||
1019 | ExternalFSValidWD = true; | |||
1020 | } | |||
1021 | } | |||
1022 | ||||
1023 | // FIXME: reuse implementation common with OverlayFSDirIterImpl as these | |||
1024 | // iterators are conceptually similar. | |||
1025 | class llvm::vfs::VFSFromYamlDirIterImpl | |||
1026 | : public llvm::vfs::detail::DirIterImpl { | |||
1027 | std::string Dir; | |||
1028 | RedirectingFileSystem::RedirectingDirectoryEntry::iterator Current, End; | |||
1029 | ||||
1030 | // To handle 'fallthrough' mode we need to iterate at first through | |||
1031 | // RedirectingDirectoryEntry and then through ExternalFS. These operations are | |||
1032 | // done sequentially, we just need to keep a track of what kind of iteration | |||
1033 | // we are currently performing. | |||
1034 | ||||
1035 | /// Flag telling if we should iterate through ExternalFS or stop at the last | |||
1036 | /// RedirectingDirectoryEntry::iterator. | |||
1037 | bool IterateExternalFS; | |||
1038 | /// Flag telling if we have switched to iterating through ExternalFS. | |||
1039 | bool IsExternalFSCurrent = false; | |||
1040 | FileSystem &ExternalFS; | |||
1041 | directory_iterator ExternalDirIter; | |||
1042 | llvm::StringSet<> SeenNames; | |||
1043 | ||||
1044 | /// To combine multiple iterations, different methods are responsible for | |||
1045 | /// different iteration steps. | |||
1046 | /// @{ | |||
1047 | ||||
1048 | /// Responsible for dispatching between RedirectingDirectoryEntry iteration | |||
1049 | /// and ExternalFS iteration. | |||
1050 | std::error_code incrementImpl(bool IsFirstTime); | |||
1051 | /// Responsible for RedirectingDirectoryEntry iteration. | |||
1052 | std::error_code incrementContent(bool IsFirstTime); | |||
1053 | /// Responsible for ExternalFS iteration. | |||
1054 | std::error_code incrementExternal(); | |||
1055 | /// @} | |||
1056 | ||||
1057 | public: | |||
1058 | VFSFromYamlDirIterImpl( | |||
1059 | const Twine &Path, | |||
1060 | RedirectingFileSystem::RedirectingDirectoryEntry::iterator Begin, | |||
1061 | RedirectingFileSystem::RedirectingDirectoryEntry::iterator End, | |||
1062 | bool IterateExternalFS, FileSystem &ExternalFS, std::error_code &EC); | |||
1063 | ||||
1064 | std::error_code increment() override; | |||
1065 | }; | |||
1066 | ||||
1067 | llvm::ErrorOr<std::string> | |||
1068 | RedirectingFileSystem::getCurrentWorkingDirectory() const { | |||
1069 | return WorkingDirectory; | |||
1070 | } | |||
1071 | ||||
1072 | std::error_code | |||
1073 | RedirectingFileSystem::setCurrentWorkingDirectory(const Twine &Path) { | |||
1074 | // Don't change the working directory if the path doesn't exist. | |||
1075 | if (!exists(Path)) | |||
1076 | return errc::no_such_file_or_directory; | |||
1077 | ||||
1078 | // Always change the external FS but ignore its result. | |||
1079 | if (ExternalFS) { | |||
1080 | auto EC = ExternalFS->setCurrentWorkingDirectory(Path); | |||
1081 | ExternalFSValidWD = !static_cast<bool>(EC); | |||
1082 | } | |||
1083 | ||||
1084 | SmallString<128> AbsolutePath; | |||
1085 | Path.toVector(AbsolutePath); | |||
1086 | if (std::error_code EC = makeAbsolute(AbsolutePath)) | |||
1087 | return EC; | |||
1088 | WorkingDirectory = std::string(AbsolutePath.str()); | |||
1089 | return {}; | |||
1090 | } | |||
1091 | ||||
1092 | std::error_code RedirectingFileSystem::isLocal(const Twine &Path, | |||
1093 | bool &Result) { | |||
1094 | return ExternalFS->isLocal(Path, Result); | |||
1095 | } | |||
1096 | ||||
1097 | std::error_code RedirectingFileSystem::makeAbsolute(SmallVectorImpl<char> &Path) const { | |||
1098 | if (llvm::sys::path::is_absolute(Path, llvm::sys::path::Style::posix) || | |||
1099 | llvm::sys::path::is_absolute(Path, llvm::sys::path::Style::windows)) | |||
1100 | return {}; | |||
1101 | ||||
1102 | auto WorkingDir = getCurrentWorkingDirectory(); | |||
1103 | if (!WorkingDir) | |||
1104 | return WorkingDir.getError(); | |||
1105 | ||||
1106 | // We can't use sys::fs::make_absolute because that assumes the path style | |||
1107 | // is native and there is no way to override that. Since we know WorkingDir | |||
1108 | // is absolute, we can use it to determine which style we actually have and | |||
1109 | // append Path ourselves. | |||
1110 | sys::path::Style style = sys::path::Style::windows; | |||
1111 | if (sys::path::is_absolute(WorkingDir.get(), sys::path::Style::posix)) { | |||
1112 | style = sys::path::Style::posix; | |||
1113 | } | |||
1114 | ||||
1115 | std::string Result = WorkingDir.get(); | |||
1116 | StringRef Dir(Result); | |||
1117 | if (!Dir.endswith(sys::path::get_separator(style))) { | |||
1118 | Result += sys::path::get_separator(style); | |||
1119 | } | |||
1120 | Result.append(Path.data(), Path.size()); | |||
1121 | Path.assign(Result.begin(), Result.end()); | |||
1122 | ||||
1123 | return {}; | |||
1124 | } | |||
1125 | ||||
1126 | directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir, | |||
1127 | std::error_code &EC) { | |||
1128 | ErrorOr<RedirectingFileSystem::Entry *> E = lookupPath(Dir); | |||
1129 | if (!E) { | |||
1130 | EC = E.getError(); | |||
1131 | if (shouldUseExternalFS() && EC == errc::no_such_file_or_directory) | |||
1132 | return ExternalFS->dir_begin(Dir, EC); | |||
1133 | return {}; | |||
1134 | } | |||
1135 | ErrorOr<Status> S = status(Dir, *E); | |||
1136 | if (!S) { | |||
1137 | EC = S.getError(); | |||
1138 | return {}; | |||
1139 | } | |||
1140 | if (!S->isDirectory()) { | |||
1141 | EC = std::error_code(static_cast<int>(errc::not_a_directory), | |||
1142 | std::system_category()); | |||
1143 | return {}; | |||
1144 | } | |||
1145 | ||||
1146 | auto *D = cast<RedirectingFileSystem::RedirectingDirectoryEntry>(*E); | |||
1147 | return directory_iterator(std::make_shared<VFSFromYamlDirIterImpl>( | |||
1148 | Dir, D->contents_begin(), D->contents_end(), | |||
1149 | /*IterateExternalFS=*/shouldUseExternalFS(), *ExternalFS, EC)); | |||
1150 | } | |||
1151 | ||||
1152 | void RedirectingFileSystem::setExternalContentsPrefixDir(StringRef PrefixDir) { | |||
1153 | ExternalContentsPrefixDir = PrefixDir.str(); | |||
1154 | } | |||
1155 | ||||
1156 | StringRef RedirectingFileSystem::getExternalContentsPrefixDir() const { | |||
1157 | return ExternalContentsPrefixDir; | |||
1158 | } | |||
1159 | ||||
1160 | void RedirectingFileSystem::setFallthrough(bool Fallthrough) { | |||
1161 | IsFallthrough = Fallthrough; | |||
1162 | } | |||
1163 | ||||
1164 | std::vector<StringRef> RedirectingFileSystem::getRoots() const { | |||
1165 | std::vector<StringRef> R; | |||
1166 | for (const auto &Root : Roots) | |||
1167 | R.push_back(Root->getName()); | |||
1168 | return R; | |||
1169 | } | |||
1170 | ||||
1171 | void RedirectingFileSystem::dump(raw_ostream &OS) const { | |||
1172 | for (const auto &Root : Roots) | |||
1173 | dumpEntry(OS, Root.get()); | |||
1174 | } | |||
1175 | ||||
1176 | void RedirectingFileSystem::dumpEntry(raw_ostream &OS, | |||
1177 | RedirectingFileSystem::Entry *E, | |||
1178 | int NumSpaces) const { | |||
1179 | StringRef Name = E->getName(); | |||
1180 | for (int i = 0, e = NumSpaces; i < e; ++i) | |||
1181 | OS << " "; | |||
1182 | OS << "'" << Name.str().c_str() << "'" | |||
1183 | << "\n"; | |||
1184 | ||||
1185 | if (E->getKind() == RedirectingFileSystem::EK_Directory) { | |||
1186 | auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(E); | |||
1187 | assert(DE && "Should be a directory")((DE && "Should be a directory") ? static_cast<void > (0) : __assert_fail ("DE && \"Should be a directory\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1187, __PRETTY_FUNCTION__)); | |||
1188 | ||||
1189 | for (std::unique_ptr<Entry> &SubEntry : | |||
1190 | llvm::make_range(DE->contents_begin(), DE->contents_end())) | |||
1191 | dumpEntry(OS, SubEntry.get(), NumSpaces + 2); | |||
1192 | } | |||
1193 | } | |||
1194 | ||||
1195 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) | |||
1196 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void RedirectingFileSystem::dump() const { dump(dbgs()); } | |||
1197 | #endif | |||
1198 | ||||
1199 | /// A helper class to hold the common YAML parsing state. | |||
1200 | class llvm::vfs::RedirectingFileSystemParser { | |||
1201 | yaml::Stream &Stream; | |||
1202 | ||||
1203 | void error(yaml::Node *N, const Twine &Msg) { Stream.printError(N, Msg); } | |||
1204 | ||||
1205 | // false on error | |||
1206 | bool parseScalarString(yaml::Node *N, StringRef &Result, | |||
1207 | SmallVectorImpl<char> &Storage) { | |||
1208 | const auto *S = dyn_cast<yaml::ScalarNode>(N); | |||
1209 | ||||
1210 | if (!S) { | |||
1211 | error(N, "expected string"); | |||
1212 | return false; | |||
1213 | } | |||
1214 | Result = S->getValue(Storage); | |||
1215 | return true; | |||
1216 | } | |||
1217 | ||||
1218 | // false on error | |||
1219 | bool parseScalarBool(yaml::Node *N, bool &Result) { | |||
1220 | SmallString<5> Storage; | |||
1221 | StringRef Value; | |||
1222 | if (!parseScalarString(N, Value, Storage)) | |||
1223 | return false; | |||
1224 | ||||
1225 | if (Value.equals_lower("true") || Value.equals_lower("on") || | |||
1226 | Value.equals_lower("yes") || Value == "1") { | |||
1227 | Result = true; | |||
1228 | return true; | |||
1229 | } else if (Value.equals_lower("false") || Value.equals_lower("off") || | |||
1230 | Value.equals_lower("no") || Value == "0") { | |||
1231 | Result = false; | |||
1232 | return true; | |||
1233 | } | |||
1234 | ||||
1235 | error(N, "expected boolean value"); | |||
1236 | return false; | |||
1237 | } | |||
1238 | ||||
1239 | struct KeyStatus { | |||
1240 | bool Required; | |||
1241 | bool Seen = false; | |||
1242 | ||||
1243 | KeyStatus(bool Required = false) : Required(Required) {} | |||
1244 | }; | |||
1245 | ||||
1246 | using KeyStatusPair = std::pair<StringRef, KeyStatus>; | |||
1247 | ||||
1248 | // false on error | |||
1249 | bool checkDuplicateOrUnknownKey(yaml::Node *KeyNode, StringRef Key, | |||
1250 | DenseMap<StringRef, KeyStatus> &Keys) { | |||
1251 | if (!Keys.count(Key)) { | |||
1252 | error(KeyNode, "unknown key"); | |||
1253 | return false; | |||
1254 | } | |||
1255 | KeyStatus &S = Keys[Key]; | |||
1256 | if (S.Seen) { | |||
1257 | error(KeyNode, Twine("duplicate key '") + Key + "'"); | |||
1258 | return false; | |||
1259 | } | |||
1260 | S.Seen = true; | |||
1261 | return true; | |||
1262 | } | |||
1263 | ||||
1264 | // false on error | |||
1265 | bool checkMissingKeys(yaml::Node *Obj, DenseMap<StringRef, KeyStatus> &Keys) { | |||
1266 | for (const auto &I : Keys) { | |||
1267 | if (I.second.Required && !I.second.Seen) { | |||
1268 | error(Obj, Twine("missing key '") + I.first + "'"); | |||
1269 | return false; | |||
1270 | } | |||
1271 | } | |||
1272 | return true; | |||
1273 | } | |||
1274 | ||||
1275 | RedirectingFileSystem::Entry * | |||
1276 | lookupOrCreateEntry(RedirectingFileSystem *FS, StringRef Name, | |||
1277 | RedirectingFileSystem::Entry *ParentEntry = nullptr) { | |||
1278 | if (!ParentEntry) { // Look for a existent root | |||
1279 | for (const auto &Root : FS->Roots) { | |||
1280 | if (Name.equals(Root->getName())) { | |||
1281 | ParentEntry = Root.get(); | |||
1282 | return ParentEntry; | |||
1283 | } | |||
1284 | } | |||
1285 | } else { // Advance to the next component | |||
1286 | auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>( | |||
1287 | ParentEntry); | |||
1288 | for (std::unique_ptr<RedirectingFileSystem::Entry> &Content : | |||
1289 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1290 | auto *DirContent = | |||
1291 | dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>( | |||
1292 | Content.get()); | |||
1293 | if (DirContent && Name.equals(Content->getName())) | |||
1294 | return DirContent; | |||
1295 | } | |||
1296 | } | |||
1297 | ||||
1298 | // ... or create a new one | |||
1299 | std::unique_ptr<RedirectingFileSystem::Entry> E = | |||
1300 | std::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>( | |||
1301 | Name, Status("", getNextVirtualUniqueID(), | |||
1302 | std::chrono::system_clock::now(), 0, 0, 0, | |||
1303 | file_type::directory_file, sys::fs::all_all)); | |||
1304 | ||||
1305 | if (!ParentEntry) { // Add a new root to the overlay | |||
1306 | FS->Roots.push_back(std::move(E)); | |||
1307 | ParentEntry = FS->Roots.back().get(); | |||
1308 | return ParentEntry; | |||
1309 | } | |||
1310 | ||||
1311 | auto *DE = | |||
1312 | cast<RedirectingFileSystem::RedirectingDirectoryEntry>(ParentEntry); | |||
1313 | DE->addContent(std::move(E)); | |||
1314 | return DE->getLastContent(); | |||
1315 | } | |||
1316 | ||||
1317 | void uniqueOverlayTree(RedirectingFileSystem *FS, | |||
1318 | RedirectingFileSystem::Entry *SrcE, | |||
1319 | RedirectingFileSystem::Entry *NewParentE = nullptr) { | |||
1320 | StringRef Name = SrcE->getName(); | |||
1321 | switch (SrcE->getKind()) { | |||
1322 | case RedirectingFileSystem::EK_Directory: { | |||
1323 | auto *DE = cast<RedirectingFileSystem::RedirectingDirectoryEntry>(SrcE); | |||
1324 | // Empty directories could be present in the YAML as a way to | |||
1325 | // describe a file for a current directory after some of its subdir | |||
1326 | // is parsed. This only leads to redundant walks, ignore it. | |||
1327 | if (!Name.empty()) | |||
1328 | NewParentE = lookupOrCreateEntry(FS, Name, NewParentE); | |||
1329 | for (std::unique_ptr<RedirectingFileSystem::Entry> &SubEntry : | |||
1330 | llvm::make_range(DE->contents_begin(), DE->contents_end())) | |||
1331 | uniqueOverlayTree(FS, SubEntry.get(), NewParentE); | |||
1332 | break; | |||
1333 | } | |||
1334 | case RedirectingFileSystem::EK_File: { | |||
1335 | assert(NewParentE && "Parent entry must exist")((NewParentE && "Parent entry must exist") ? static_cast <void> (0) : __assert_fail ("NewParentE && \"Parent entry must exist\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1335, __PRETTY_FUNCTION__)); | |||
1336 | auto *FE = cast<RedirectingFileSystem::RedirectingFileEntry>(SrcE); | |||
1337 | auto *DE = | |||
1338 | cast<RedirectingFileSystem::RedirectingDirectoryEntry>(NewParentE); | |||
1339 | DE->addContent( | |||
1340 | std::make_unique<RedirectingFileSystem::RedirectingFileEntry>( | |||
1341 | Name, FE->getExternalContentsPath(), FE->getUseName())); | |||
1342 | break; | |||
1343 | } | |||
1344 | } | |||
1345 | } | |||
1346 | ||||
1347 | std::unique_ptr<RedirectingFileSystem::Entry> | |||
1348 | parseEntry(yaml::Node *N, RedirectingFileSystem *FS, bool IsRootEntry) { | |||
1349 | auto *M = dyn_cast<yaml::MappingNode>(N); | |||
1350 | if (!M) { | |||
1351 | error(N, "expected mapping node for file or directory entry"); | |||
1352 | return nullptr; | |||
1353 | } | |||
1354 | ||||
1355 | KeyStatusPair Fields[] = { | |||
1356 | KeyStatusPair("name", true), | |||
1357 | KeyStatusPair("type", true), | |||
1358 | KeyStatusPair("contents", false), | |||
1359 | KeyStatusPair("external-contents", false), | |||
1360 | KeyStatusPair("use-external-name", false), | |||
1361 | }; | |||
1362 | ||||
1363 | DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields)); | |||
1364 | ||||
1365 | bool HasContents = false; // external or otherwise | |||
1366 | std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> | |||
1367 | EntryArrayContents; | |||
1368 | SmallString<256> ExternalContentsPath; | |||
1369 | SmallString<256> Name; | |||
1370 | yaml::Node *NameValueNode = nullptr; | |||
1371 | auto UseExternalName = | |||
1372 | RedirectingFileSystem::RedirectingFileEntry::NK_NotSet; | |||
1373 | RedirectingFileSystem::EntryKind Kind; | |||
1374 | ||||
1375 | for (auto &I : *M) { | |||
1376 | StringRef Key; | |||
1377 | // Reuse the buffer for key and value, since we don't look at key after | |||
1378 | // parsing value. | |||
1379 | SmallString<256> Buffer; | |||
1380 | if (!parseScalarString(I.getKey(), Key, Buffer)) | |||
1381 | return nullptr; | |||
1382 | ||||
1383 | if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys)) | |||
1384 | return nullptr; | |||
1385 | ||||
1386 | StringRef Value; | |||
1387 | if (Key == "name") { | |||
1388 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1389 | return nullptr; | |||
1390 | ||||
1391 | NameValueNode = I.getValue(); | |||
1392 | // Guarantee that old YAML files containing paths with ".." and "." | |||
1393 | // are properly canonicalized before read into the VFS. | |||
1394 | Name = canonicalize(Value).str(); | |||
1395 | } else if (Key == "type") { | |||
1396 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1397 | return nullptr; | |||
1398 | if (Value == "file") | |||
1399 | Kind = RedirectingFileSystem::EK_File; | |||
1400 | else if (Value == "directory") | |||
1401 | Kind = RedirectingFileSystem::EK_Directory; | |||
1402 | else { | |||
1403 | error(I.getValue(), "unknown value for 'type'"); | |||
1404 | return nullptr; | |||
1405 | } | |||
1406 | } else if (Key == "contents") { | |||
1407 | if (HasContents) { | |||
1408 | error(I.getKey(), | |||
1409 | "entry already has 'contents' or 'external-contents'"); | |||
1410 | return nullptr; | |||
1411 | } | |||
1412 | HasContents = true; | |||
1413 | auto *Contents = dyn_cast<yaml::SequenceNode>(I.getValue()); | |||
1414 | if (!Contents) { | |||
1415 | // FIXME: this is only for directories, what about files? | |||
1416 | error(I.getValue(), "expected array"); | |||
1417 | return nullptr; | |||
1418 | } | |||
1419 | ||||
1420 | for (auto &I : *Contents) { | |||
1421 | if (std::unique_ptr<RedirectingFileSystem::Entry> E = | |||
1422 | parseEntry(&I, FS, /*IsRootEntry*/ false)) | |||
1423 | EntryArrayContents.push_back(std::move(E)); | |||
1424 | else | |||
1425 | return nullptr; | |||
1426 | } | |||
1427 | } else if (Key == "external-contents") { | |||
1428 | if (HasContents) { | |||
1429 | error(I.getKey(), | |||
1430 | "entry already has 'contents' or 'external-contents'"); | |||
1431 | return nullptr; | |||
1432 | } | |||
1433 | HasContents = true; | |||
1434 | if (!parseScalarString(I.getValue(), Value, Buffer)) | |||
1435 | return nullptr; | |||
1436 | ||||
1437 | SmallString<256> FullPath; | |||
1438 | if (FS->IsRelativeOverlay) { | |||
1439 | FullPath = FS->getExternalContentsPrefixDir(); | |||
1440 | assert(!FullPath.empty() &&((!FullPath.empty() && "External contents prefix directory must exist" ) ? static_cast<void> (0) : __assert_fail ("!FullPath.empty() && \"External contents prefix directory must exist\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1441, __PRETTY_FUNCTION__)) | |||
1441 | "External contents prefix directory must exist")((!FullPath.empty() && "External contents prefix directory must exist" ) ? static_cast<void> (0) : __assert_fail ("!FullPath.empty() && \"External contents prefix directory must exist\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1441, __PRETTY_FUNCTION__)); | |||
1442 | llvm::sys::path::append(FullPath, Value); | |||
1443 | } else { | |||
1444 | FullPath = Value; | |||
1445 | } | |||
1446 | ||||
1447 | // Guarantee that old YAML files containing paths with ".." and "." | |||
1448 | // are properly canonicalized before read into the VFS. | |||
1449 | FullPath = canonicalize(FullPath); | |||
1450 | ExternalContentsPath = FullPath.str(); | |||
1451 | } else if (Key == "use-external-name") { | |||
1452 | bool Val; | |||
1453 | if (!parseScalarBool(I.getValue(), Val)) | |||
1454 | return nullptr; | |||
1455 | UseExternalName = | |||
1456 | Val ? RedirectingFileSystem::RedirectingFileEntry::NK_External | |||
1457 | : RedirectingFileSystem::RedirectingFileEntry::NK_Virtual; | |||
1458 | } else { | |||
1459 | llvm_unreachable("key missing from Keys")::llvm::llvm_unreachable_internal("key missing from Keys", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1459); | |||
1460 | } | |||
1461 | } | |||
1462 | ||||
1463 | if (Stream.failed()) | |||
1464 | return nullptr; | |||
1465 | ||||
1466 | // check for missing keys | |||
1467 | if (!HasContents) { | |||
1468 | error(N, "missing key 'contents' or 'external-contents'"); | |||
1469 | return nullptr; | |||
1470 | } | |||
1471 | if (!checkMissingKeys(N, Keys)) | |||
1472 | return nullptr; | |||
1473 | ||||
1474 | // check invalid configuration | |||
1475 | if (Kind == RedirectingFileSystem::EK_Directory && | |||
1476 | UseExternalName != | |||
1477 | RedirectingFileSystem::RedirectingFileEntry::NK_NotSet) { | |||
1478 | error(N, "'use-external-name' is not supported for directories"); | |||
1479 | return nullptr; | |||
1480 | } | |||
1481 | ||||
1482 | sys::path::Style path_style = sys::path::Style::native; | |||
1483 | if (IsRootEntry) { | |||
1484 | // VFS root entries may be in either Posix or Windows style. Figure out | |||
1485 | // which style we have, and use it consistently. | |||
1486 | if (sys::path::is_absolute(Name, sys::path::Style::posix)) { | |||
1487 | path_style = sys::path::Style::posix; | |||
1488 | } else if (sys::path::is_absolute(Name, sys::path::Style::windows)) { | |||
1489 | path_style = sys::path::Style::windows; | |||
1490 | } else { | |||
1491 | assert(NameValueNode && "Name presence should be checked earlier")((NameValueNode && "Name presence should be checked earlier" ) ? static_cast<void> (0) : __assert_fail ("NameValueNode && \"Name presence should be checked earlier\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1491, __PRETTY_FUNCTION__)); | |||
1492 | error(NameValueNode, | |||
1493 | "entry with relative path at the root level is not discoverable"); | |||
1494 | return nullptr; | |||
1495 | } | |||
1496 | } | |||
1497 | ||||
1498 | // Remove trailing slash(es), being careful not to remove the root path | |||
1499 | StringRef Trimmed(Name); | |||
1500 | size_t RootPathLen = sys::path::root_path(Trimmed, path_style).size(); | |||
1501 | while (Trimmed.size() > RootPathLen && | |||
1502 | sys::path::is_separator(Trimmed.back(), path_style)) | |||
1503 | Trimmed = Trimmed.slice(0, Trimmed.size() - 1); | |||
1504 | ||||
1505 | // Get the last component | |||
1506 | StringRef LastComponent = sys::path::filename(Trimmed, path_style); | |||
1507 | ||||
1508 | std::unique_ptr<RedirectingFileSystem::Entry> Result; | |||
1509 | switch (Kind) { | |||
1510 | case RedirectingFileSystem::EK_File: | |||
1511 | Result = std::make_unique<RedirectingFileSystem::RedirectingFileEntry>( | |||
1512 | LastComponent, std::move(ExternalContentsPath), UseExternalName); | |||
1513 | break; | |||
1514 | case RedirectingFileSystem::EK_Directory: | |||
1515 | Result = | |||
1516 | std::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>( | |||
1517 | LastComponent, std::move(EntryArrayContents), | |||
1518 | Status("", getNextVirtualUniqueID(), | |||
1519 | std::chrono::system_clock::now(), 0, 0, 0, | |||
1520 | file_type::directory_file, sys::fs::all_all)); | |||
1521 | break; | |||
1522 | } | |||
1523 | ||||
1524 | StringRef Parent = sys::path::parent_path(Trimmed, path_style); | |||
1525 | if (Parent.empty()) | |||
1526 | return Result; | |||
1527 | ||||
1528 | // if 'name' contains multiple components, create implicit directory entries | |||
1529 | for (sys::path::reverse_iterator I = sys::path::rbegin(Parent, path_style), | |||
1530 | E = sys::path::rend(Parent); | |||
1531 | I != E; ++I) { | |||
1532 | std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> Entries; | |||
1533 | Entries.push_back(std::move(Result)); | |||
1534 | Result = | |||
1535 | std::make_unique<RedirectingFileSystem::RedirectingDirectoryEntry>( | |||
1536 | *I, std::move(Entries), | |||
1537 | Status("", getNextVirtualUniqueID(), | |||
1538 | std::chrono::system_clock::now(), 0, 0, 0, | |||
1539 | file_type::directory_file, sys::fs::all_all)); | |||
1540 | } | |||
1541 | return Result; | |||
1542 | } | |||
1543 | ||||
1544 | public: | |||
1545 | RedirectingFileSystemParser(yaml::Stream &S) : Stream(S) {} | |||
1546 | ||||
1547 | // false on error | |||
1548 | bool parse(yaml::Node *Root, RedirectingFileSystem *FS) { | |||
1549 | auto *Top = dyn_cast<yaml::MappingNode>(Root); | |||
1550 | if (!Top) { | |||
1551 | error(Root, "expected mapping node"); | |||
1552 | return false; | |||
1553 | } | |||
1554 | ||||
1555 | KeyStatusPair Fields[] = { | |||
1556 | KeyStatusPair("version", true), | |||
1557 | KeyStatusPair("case-sensitive", false), | |||
1558 | KeyStatusPair("use-external-names", false), | |||
1559 | KeyStatusPair("overlay-relative", false), | |||
1560 | KeyStatusPair("fallthrough", false), | |||
1561 | KeyStatusPair("roots", true), | |||
1562 | }; | |||
1563 | ||||
1564 | DenseMap<StringRef, KeyStatus> Keys(std::begin(Fields), std::end(Fields)); | |||
1565 | std::vector<std::unique_ptr<RedirectingFileSystem::Entry>> RootEntries; | |||
1566 | ||||
1567 | // Parse configuration and 'roots' | |||
1568 | for (auto &I : *Top) { | |||
1569 | SmallString<10> KeyBuffer; | |||
1570 | StringRef Key; | |||
1571 | if (!parseScalarString(I.getKey(), Key, KeyBuffer)) | |||
1572 | return false; | |||
1573 | ||||
1574 | if (!checkDuplicateOrUnknownKey(I.getKey(), Key, Keys)) | |||
1575 | return false; | |||
1576 | ||||
1577 | if (Key == "roots") { | |||
1578 | auto *Roots = dyn_cast<yaml::SequenceNode>(I.getValue()); | |||
1579 | if (!Roots) { | |||
1580 | error(I.getValue(), "expected array"); | |||
1581 | return false; | |||
1582 | } | |||
1583 | ||||
1584 | for (auto &I : *Roots) { | |||
1585 | if (std::unique_ptr<RedirectingFileSystem::Entry> E = | |||
1586 | parseEntry(&I, FS, /*IsRootEntry*/ true)) | |||
1587 | RootEntries.push_back(std::move(E)); | |||
1588 | else | |||
1589 | return false; | |||
1590 | } | |||
1591 | } else if (Key == "version") { | |||
1592 | StringRef VersionString; | |||
1593 | SmallString<4> Storage; | |||
1594 | if (!parseScalarString(I.getValue(), VersionString, Storage)) | |||
1595 | return false; | |||
1596 | int Version; | |||
1597 | if (VersionString.getAsInteger<int>(10, Version)) { | |||
1598 | error(I.getValue(), "expected integer"); | |||
1599 | return false; | |||
1600 | } | |||
1601 | if (Version < 0) { | |||
1602 | error(I.getValue(), "invalid version number"); | |||
1603 | return false; | |||
1604 | } | |||
1605 | if (Version != 0) { | |||
1606 | error(I.getValue(), "version mismatch, expected 0"); | |||
1607 | return false; | |||
1608 | } | |||
1609 | } else if (Key == "case-sensitive") { | |||
1610 | if (!parseScalarBool(I.getValue(), FS->CaseSensitive)) | |||
1611 | return false; | |||
1612 | } else if (Key == "overlay-relative") { | |||
1613 | if (!parseScalarBool(I.getValue(), FS->IsRelativeOverlay)) | |||
1614 | return false; | |||
1615 | } else if (Key == "use-external-names") { | |||
1616 | if (!parseScalarBool(I.getValue(), FS->UseExternalNames)) | |||
1617 | return false; | |||
1618 | } else if (Key == "fallthrough") { | |||
1619 | if (!parseScalarBool(I.getValue(), FS->IsFallthrough)) | |||
1620 | return false; | |||
1621 | } else { | |||
1622 | llvm_unreachable("key missing from Keys")::llvm::llvm_unreachable_internal("key missing from Keys", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1622); | |||
1623 | } | |||
1624 | } | |||
1625 | ||||
1626 | if (Stream.failed()) | |||
1627 | return false; | |||
1628 | ||||
1629 | if (!checkMissingKeys(Top, Keys)) | |||
1630 | return false; | |||
1631 | ||||
1632 | // Now that we sucessefully parsed the YAML file, canonicalize the internal | |||
1633 | // representation to a proper directory tree so that we can search faster | |||
1634 | // inside the VFS. | |||
1635 | for (auto &E : RootEntries) | |||
1636 | uniqueOverlayTree(FS, E.get()); | |||
1637 | ||||
1638 | return true; | |||
1639 | } | |||
1640 | }; | |||
1641 | ||||
1642 | RedirectingFileSystem * | |||
1643 | RedirectingFileSystem::create(std::unique_ptr<MemoryBuffer> Buffer, | |||
1644 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1645 | StringRef YAMLFilePath, void *DiagContext, | |||
1646 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1647 | SourceMgr SM; | |||
1648 | yaml::Stream Stream(Buffer->getMemBufferRef(), SM); | |||
1649 | ||||
1650 | SM.setDiagHandler(DiagHandler, DiagContext); | |||
1651 | yaml::document_iterator DI = Stream.begin(); | |||
1652 | yaml::Node *Root = DI->getRoot(); | |||
1653 | if (DI == Stream.end() || !Root) { | |||
1654 | SM.PrintMessage(SMLoc(), SourceMgr::DK_Error, "expected root node"); | |||
1655 | return nullptr; | |||
1656 | } | |||
1657 | ||||
1658 | RedirectingFileSystemParser P(Stream); | |||
1659 | ||||
1660 | std::unique_ptr<RedirectingFileSystem> FS( | |||
1661 | new RedirectingFileSystem(ExternalFS)); | |||
1662 | ||||
1663 | if (!YAMLFilePath.empty()) { | |||
1664 | // Use the YAML path from -ivfsoverlay to compute the dir to be prefixed | |||
1665 | // to each 'external-contents' path. | |||
1666 | // | |||
1667 | // Example: | |||
1668 | // -ivfsoverlay dummy.cache/vfs/vfs.yaml | |||
1669 | // yields: | |||
1670 | // FS->ExternalContentsPrefixDir => /<absolute_path_to>/dummy.cache/vfs | |||
1671 | // | |||
1672 | SmallString<256> OverlayAbsDir = sys::path::parent_path(YAMLFilePath); | |||
1673 | std::error_code EC = llvm::sys::fs::make_absolute(OverlayAbsDir); | |||
1674 | assert(!EC && "Overlay dir final path must be absolute")((!EC && "Overlay dir final path must be absolute") ? static_cast<void> (0) : __assert_fail ("!EC && \"Overlay dir final path must be absolute\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1674, __PRETTY_FUNCTION__)); | |||
1675 | (void)EC; | |||
1676 | FS->setExternalContentsPrefixDir(OverlayAbsDir); | |||
1677 | } | |||
1678 | ||||
1679 | if (!P.parse(Root, FS.get())) | |||
1680 | return nullptr; | |||
1681 | ||||
1682 | return FS.release(); | |||
1683 | } | |||
1684 | ||||
1685 | ErrorOr<RedirectingFileSystem::Entry *> | |||
1686 | RedirectingFileSystem::lookupPath(const Twine &Path_) const { | |||
1687 | SmallString<256> Path; | |||
1688 | Path_.toVector(Path); | |||
1689 | ||||
1690 | // Handle relative paths | |||
1691 | if (std::error_code EC = makeAbsolute(Path)) | |||
1692 | return EC; | |||
1693 | ||||
1694 | // Canonicalize path by removing ".", "..", "./", components. This is | |||
1695 | // a VFS request, do not bother about symlinks in the path components | |||
1696 | // but canonicalize in order to perform the correct entry search. | |||
1697 | Path = canonicalize(Path); | |||
1698 | if (Path.empty()) | |||
1699 | return make_error_code(llvm::errc::invalid_argument); | |||
1700 | ||||
1701 | sys::path::const_iterator Start = sys::path::begin(Path); | |||
1702 | sys::path::const_iterator End = sys::path::end(Path); | |||
1703 | for (const auto &Root : Roots) { | |||
1704 | ErrorOr<RedirectingFileSystem::Entry *> Result = | |||
1705 | lookupPath(Start, End, Root.get()); | |||
1706 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
1707 | return Result; | |||
1708 | } | |||
1709 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1710 | } | |||
1711 | ||||
1712 | ErrorOr<RedirectingFileSystem::Entry *> | |||
1713 | RedirectingFileSystem::lookupPath(sys::path::const_iterator Start, | |||
1714 | sys::path::const_iterator End, | |||
1715 | RedirectingFileSystem::Entry *From) const { | |||
1716 | assert(!isTraversalComponent(*Start) &&((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1718, __PRETTY_FUNCTION__)) | |||
1717 | !isTraversalComponent(From->getName()) &&((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1718, __PRETTY_FUNCTION__)) | |||
1718 | "Paths should not contain traversal components")((!isTraversalComponent(*Start) && !isTraversalComponent (From->getName()) && "Paths should not contain traversal components" ) ? static_cast<void> (0) : __assert_fail ("!isTraversalComponent(*Start) && !isTraversalComponent(From->getName()) && \"Paths should not contain traversal components\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1718, __PRETTY_FUNCTION__)); | |||
1719 | ||||
1720 | StringRef FromName = From->getName(); | |||
1721 | ||||
1722 | // Forward the search to the next component in case this is an empty one. | |||
1723 | if (!FromName.empty()) { | |||
1724 | if (!pathComponentMatches(*Start, FromName)) | |||
1725 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1726 | ||||
1727 | ++Start; | |||
1728 | ||||
1729 | if (Start == End) { | |||
1730 | // Match! | |||
1731 | return From; | |||
1732 | } | |||
1733 | } | |||
1734 | ||||
1735 | auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(From); | |||
1736 | if (!DE) | |||
1737 | return make_error_code(llvm::errc::not_a_directory); | |||
1738 | ||||
1739 | for (const std::unique_ptr<RedirectingFileSystem::Entry> &DirEntry : | |||
1740 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1741 | ErrorOr<RedirectingFileSystem::Entry *> Result = | |||
1742 | lookupPath(Start, End, DirEntry.get()); | |||
1743 | if (Result || Result.getError() != llvm::errc::no_such_file_or_directory) | |||
1744 | return Result; | |||
1745 | } | |||
1746 | ||||
1747 | return make_error_code(llvm::errc::no_such_file_or_directory); | |||
1748 | } | |||
1749 | ||||
1750 | static Status getRedirectedFileStatus(const Twine &Path, bool UseExternalNames, | |||
1751 | Status ExternalStatus) { | |||
1752 | Status S = ExternalStatus; | |||
1753 | if (!UseExternalNames) | |||
1754 | S = Status::copyWithNewName(S, Path); | |||
1755 | S.IsVFSMapped = true; | |||
1756 | return S; | |||
1757 | } | |||
1758 | ||||
1759 | ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path, | |||
1760 | RedirectingFileSystem::Entry *E) { | |||
1761 | assert(E != nullptr)((E != nullptr) ? static_cast<void> (0) : __assert_fail ("E != nullptr", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1761, __PRETTY_FUNCTION__)); | |||
1762 | if (auto *F = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(E)) { | |||
1763 | ErrorOr<Status> S = ExternalFS->status(F->getExternalContentsPath()); | |||
1764 | assert(!S || S->getName() == F->getExternalContentsPath())((!S || S->getName() == F->getExternalContentsPath()) ? static_cast<void> (0) : __assert_fail ("!S || S->getName() == F->getExternalContentsPath()" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1764, __PRETTY_FUNCTION__)); | |||
1765 | if (S) | |||
1766 | return getRedirectedFileStatus(Path, F->useExternalName(UseExternalNames), | |||
1767 | *S); | |||
1768 | return S; | |||
1769 | } else { // directory | |||
1770 | auto *DE = cast<RedirectingFileSystem::RedirectingDirectoryEntry>(E); | |||
1771 | return Status::copyWithNewName(DE->getStatus(), Path); | |||
1772 | } | |||
1773 | } | |||
1774 | ||||
1775 | ErrorOr<Status> RedirectingFileSystem::status(const Twine &Path) { | |||
1776 | ErrorOr<RedirectingFileSystem::Entry *> Result = lookupPath(Path); | |||
1777 | if (!Result) { | |||
1778 | if (shouldUseExternalFS() && | |||
1779 | Result.getError() == llvm::errc::no_such_file_or_directory) { | |||
1780 | return ExternalFS->status(Path); | |||
1781 | } | |||
1782 | return Result.getError(); | |||
1783 | } | |||
1784 | return status(Path, *Result); | |||
1785 | } | |||
1786 | ||||
1787 | namespace { | |||
1788 | ||||
1789 | /// Provide a file wrapper with an overriden status. | |||
1790 | class FileWithFixedStatus : public File { | |||
1791 | std::unique_ptr<File> InnerFile; | |||
1792 | Status S; | |||
1793 | ||||
1794 | public: | |||
1795 | FileWithFixedStatus(std::unique_ptr<File> InnerFile, Status S) | |||
1796 | : InnerFile(std::move(InnerFile)), S(std::move(S)) {} | |||
1797 | ||||
1798 | ErrorOr<Status> status() override { return S; } | |||
1799 | ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> | |||
1800 | ||||
1801 | getBuffer(const Twine &Name, int64_t FileSize, bool RequiresNullTerminator, | |||
1802 | bool IsVolatile) override { | |||
1803 | return InnerFile->getBuffer(Name, FileSize, RequiresNullTerminator, | |||
1804 | IsVolatile); | |||
1805 | } | |||
1806 | ||||
1807 | std::error_code close() override { return InnerFile->close(); } | |||
1808 | }; | |||
1809 | ||||
1810 | } // namespace | |||
1811 | ||||
1812 | ErrorOr<std::unique_ptr<File>> | |||
1813 | RedirectingFileSystem::openFileForRead(const Twine &Path) { | |||
1814 | ErrorOr<RedirectingFileSystem::Entry *> E = lookupPath(Path); | |||
1815 | if (!E) { | |||
1816 | if (shouldUseExternalFS() && | |||
1817 | E.getError() == llvm::errc::no_such_file_or_directory) { | |||
1818 | return ExternalFS->openFileForRead(Path); | |||
1819 | } | |||
1820 | return E.getError(); | |||
1821 | } | |||
1822 | ||||
1823 | auto *F = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(*E); | |||
1824 | if (!F) // FIXME: errc::not_a_file? | |||
1825 | return make_error_code(llvm::errc::invalid_argument); | |||
1826 | ||||
1827 | auto Result = ExternalFS->openFileForRead(F->getExternalContentsPath()); | |||
1828 | if (!Result) | |||
1829 | return Result; | |||
1830 | ||||
1831 | auto ExternalStatus = (*Result)->status(); | |||
1832 | if (!ExternalStatus) | |||
1833 | return ExternalStatus.getError(); | |||
1834 | ||||
1835 | // FIXME: Update the status with the name and VFSMapped. | |||
1836 | Status S = getRedirectedFileStatus(Path, F->useExternalName(UseExternalNames), | |||
1837 | *ExternalStatus); | |||
1838 | return std::unique_ptr<File>( | |||
1839 | std::make_unique<FileWithFixedStatus>(std::move(*Result), S)); | |||
1840 | } | |||
1841 | ||||
1842 | std::error_code | |||
1843 | RedirectingFileSystem::getRealPath(const Twine &Path, | |||
1844 | SmallVectorImpl<char> &Output) const { | |||
1845 | ErrorOr<RedirectingFileSystem::Entry *> Result = lookupPath(Path); | |||
1846 | if (!Result) { | |||
1847 | if (shouldUseExternalFS() && | |||
1848 | Result.getError() == llvm::errc::no_such_file_or_directory) { | |||
1849 | return ExternalFS->getRealPath(Path, Output); | |||
1850 | } | |||
1851 | return Result.getError(); | |||
1852 | } | |||
1853 | ||||
1854 | if (auto *F = | |||
1855 | dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(*Result)) { | |||
1856 | return ExternalFS->getRealPath(F->getExternalContentsPath(), Output); | |||
1857 | } | |||
1858 | // Even if there is a directory entry, fall back to ExternalFS if allowed, | |||
1859 | // because directories don't have a single external contents path. | |||
1860 | return shouldUseExternalFS() ? ExternalFS->getRealPath(Path, Output) | |||
1861 | : llvm::errc::invalid_argument; | |||
1862 | } | |||
1863 | ||||
1864 | IntrusiveRefCntPtr<FileSystem> | |||
1865 | vfs::getVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer, | |||
1866 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1867 | StringRef YAMLFilePath, void *DiagContext, | |||
1868 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1869 | return RedirectingFileSystem::create(std::move(Buffer), DiagHandler, | |||
1870 | YAMLFilePath, DiagContext, | |||
1871 | std::move(ExternalFS)); | |||
1872 | } | |||
1873 | ||||
1874 | static void getVFSEntries(RedirectingFileSystem::Entry *SrcE, | |||
1875 | SmallVectorImpl<StringRef> &Path, | |||
1876 | SmallVectorImpl<YAMLVFSEntry> &Entries) { | |||
1877 | auto Kind = SrcE->getKind(); | |||
1878 | if (Kind == RedirectingFileSystem::EK_Directory) { | |||
1879 | auto *DE = dyn_cast<RedirectingFileSystem::RedirectingDirectoryEntry>(SrcE); | |||
1880 | assert(DE && "Must be a directory")((DE && "Must be a directory") ? static_cast<void> (0) : __assert_fail ("DE && \"Must be a directory\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1880, __PRETTY_FUNCTION__)); | |||
1881 | for (std::unique_ptr<RedirectingFileSystem::Entry> &SubEntry : | |||
1882 | llvm::make_range(DE->contents_begin(), DE->contents_end())) { | |||
1883 | Path.push_back(SubEntry->getName()); | |||
1884 | getVFSEntries(SubEntry.get(), Path, Entries); | |||
1885 | Path.pop_back(); | |||
1886 | } | |||
1887 | return; | |||
1888 | } | |||
1889 | ||||
1890 | assert(Kind == RedirectingFileSystem::EK_File && "Must be a EK_File")((Kind == RedirectingFileSystem::EK_File && "Must be a EK_File" ) ? static_cast<void> (0) : __assert_fail ("Kind == RedirectingFileSystem::EK_File && \"Must be a EK_File\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1890, __PRETTY_FUNCTION__)); | |||
1891 | auto *FE = dyn_cast<RedirectingFileSystem::RedirectingFileEntry>(SrcE); | |||
1892 | assert(FE && "Must be a file")((FE && "Must be a file") ? static_cast<void> ( 0) : __assert_fail ("FE && \"Must be a file\"", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1892, __PRETTY_FUNCTION__)); | |||
1893 | SmallString<128> VPath; | |||
1894 | for (auto &Comp : Path) | |||
1895 | llvm::sys::path::append(VPath, Comp); | |||
1896 | Entries.push_back(YAMLVFSEntry(VPath.c_str(), FE->getExternalContentsPath())); | |||
1897 | } | |||
1898 | ||||
1899 | void vfs::collectVFSFromYAML(std::unique_ptr<MemoryBuffer> Buffer, | |||
1900 | SourceMgr::DiagHandlerTy DiagHandler, | |||
1901 | StringRef YAMLFilePath, | |||
1902 | SmallVectorImpl<YAMLVFSEntry> &CollectedEntries, | |||
1903 | void *DiagContext, | |||
1904 | IntrusiveRefCntPtr<FileSystem> ExternalFS) { | |||
1905 | RedirectingFileSystem *VFS = RedirectingFileSystem::create( | |||
| ||||
1906 | std::move(Buffer), DiagHandler, YAMLFilePath, DiagContext, | |||
1907 | std::move(ExternalFS)); | |||
1908 | ErrorOr<RedirectingFileSystem::Entry *> RootE = VFS->lookupPath("/"); | |||
| ||||
1909 | if (!RootE) | |||
1910 | return; | |||
1911 | SmallVector<StringRef, 8> Components; | |||
1912 | Components.push_back("/"); | |||
1913 | getVFSEntries(*RootE, Components, CollectedEntries); | |||
1914 | } | |||
1915 | ||||
1916 | UniqueID vfs::getNextVirtualUniqueID() { | |||
1917 | static std::atomic<unsigned> UID; | |||
1918 | unsigned ID = ++UID; | |||
1919 | // The following assumes that uint64_t max will never collide with a real | |||
1920 | // dev_t value from the OS. | |||
1921 | return UniqueID(std::numeric_limits<uint64_t>::max(), ID); | |||
1922 | } | |||
1923 | ||||
1924 | void YAMLVFSWriter::addEntry(StringRef VirtualPath, StringRef RealPath, | |||
1925 | bool IsDirectory) { | |||
1926 | assert(sys::path::is_absolute(VirtualPath) && "virtual path not absolute")((sys::path::is_absolute(VirtualPath) && "virtual path not absolute" ) ? static_cast<void> (0) : __assert_fail ("sys::path::is_absolute(VirtualPath) && \"virtual path not absolute\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1926, __PRETTY_FUNCTION__)); | |||
1927 | assert(sys::path::is_absolute(RealPath) && "real path not absolute")((sys::path::is_absolute(RealPath) && "real path not absolute" ) ? static_cast<void> (0) : __assert_fail ("sys::path::is_absolute(RealPath) && \"real path not absolute\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1927, __PRETTY_FUNCTION__)); | |||
1928 | assert(!pathHasTraversal(VirtualPath) && "path traversal is not supported")((!pathHasTraversal(VirtualPath) && "path traversal is not supported" ) ? static_cast<void> (0) : __assert_fail ("!pathHasTraversal(VirtualPath) && \"path traversal is not supported\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1928, __PRETTY_FUNCTION__)); | |||
1929 | Mappings.emplace_back(VirtualPath, RealPath, IsDirectory); | |||
1930 | } | |||
1931 | ||||
1932 | void YAMLVFSWriter::addFileMapping(StringRef VirtualPath, StringRef RealPath) { | |||
1933 | addEntry(VirtualPath, RealPath, /*IsDirectory=*/false); | |||
1934 | } | |||
1935 | ||||
1936 | void YAMLVFSWriter::addDirectoryMapping(StringRef VirtualPath, | |||
1937 | StringRef RealPath) { | |||
1938 | addEntry(VirtualPath, RealPath, /*IsDirectory=*/true); | |||
1939 | } | |||
1940 | ||||
1941 | namespace { | |||
1942 | ||||
1943 | class JSONWriter { | |||
1944 | llvm::raw_ostream &OS; | |||
1945 | SmallVector<StringRef, 16> DirStack; | |||
1946 | ||||
1947 | unsigned getDirIndent() { return 4 * DirStack.size(); } | |||
1948 | unsigned getFileIndent() { return 4 * (DirStack.size() + 1); } | |||
1949 | bool containedIn(StringRef Parent, StringRef Path); | |||
1950 | StringRef containedPart(StringRef Parent, StringRef Path); | |||
1951 | void startDirectory(StringRef Path); | |||
1952 | void endDirectory(); | |||
1953 | void writeEntry(StringRef VPath, StringRef RPath); | |||
1954 | ||||
1955 | public: | |||
1956 | JSONWriter(llvm::raw_ostream &OS) : OS(OS) {} | |||
1957 | ||||
1958 | void write(ArrayRef<YAMLVFSEntry> Entries, Optional<bool> UseExternalNames, | |||
1959 | Optional<bool> IsCaseSensitive, Optional<bool> IsOverlayRelative, | |||
1960 | StringRef OverlayDir); | |||
1961 | }; | |||
1962 | ||||
1963 | } // namespace | |||
1964 | ||||
1965 | bool JSONWriter::containedIn(StringRef Parent, StringRef Path) { | |||
1966 | using namespace llvm::sys; | |||
1967 | ||||
1968 | // Compare each path component. | |||
1969 | auto IParent = path::begin(Parent), EParent = path::end(Parent); | |||
1970 | for (auto IChild = path::begin(Path), EChild = path::end(Path); | |||
1971 | IParent != EParent && IChild != EChild; ++IParent, ++IChild) { | |||
1972 | if (*IParent != *IChild) | |||
1973 | return false; | |||
1974 | } | |||
1975 | // Have we exhausted the parent path? | |||
1976 | return IParent == EParent; | |||
1977 | } | |||
1978 | ||||
1979 | StringRef JSONWriter::containedPart(StringRef Parent, StringRef Path) { | |||
1980 | assert(!Parent.empty())((!Parent.empty()) ? static_cast<void> (0) : __assert_fail ("!Parent.empty()", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1980, __PRETTY_FUNCTION__)); | |||
1981 | assert(containedIn(Parent, Path))((containedIn(Parent, Path)) ? static_cast<void> (0) : __assert_fail ("containedIn(Parent, Path)", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 1981, __PRETTY_FUNCTION__)); | |||
1982 | return Path.slice(Parent.size() + 1, StringRef::npos); | |||
1983 | } | |||
1984 | ||||
1985 | void JSONWriter::startDirectory(StringRef Path) { | |||
1986 | StringRef Name = | |||
1987 | DirStack.empty() ? Path : containedPart(DirStack.back(), Path); | |||
1988 | DirStack.push_back(Path); | |||
1989 | unsigned Indent = getDirIndent(); | |||
1990 | OS.indent(Indent) << "{\n"; | |||
1991 | OS.indent(Indent + 2) << "'type': 'directory',\n"; | |||
1992 | OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(Name) << "\",\n"; | |||
1993 | OS.indent(Indent + 2) << "'contents': [\n"; | |||
1994 | } | |||
1995 | ||||
1996 | void JSONWriter::endDirectory() { | |||
1997 | unsigned Indent = getDirIndent(); | |||
1998 | OS.indent(Indent + 2) << "]\n"; | |||
1999 | OS.indent(Indent) << "}"; | |||
2000 | ||||
2001 | DirStack.pop_back(); | |||
2002 | } | |||
2003 | ||||
2004 | void JSONWriter::writeEntry(StringRef VPath, StringRef RPath) { | |||
2005 | unsigned Indent = getFileIndent(); | |||
2006 | OS.indent(Indent) << "{\n"; | |||
2007 | OS.indent(Indent + 2) << "'type': 'file',\n"; | |||
2008 | OS.indent(Indent + 2) << "'name': \"" << llvm::yaml::escape(VPath) << "\",\n"; | |||
2009 | OS.indent(Indent + 2) << "'external-contents': \"" | |||
2010 | << llvm::yaml::escape(RPath) << "\"\n"; | |||
2011 | OS.indent(Indent) << "}"; | |||
2012 | } | |||
2013 | ||||
2014 | void JSONWriter::write(ArrayRef<YAMLVFSEntry> Entries, | |||
2015 | Optional<bool> UseExternalNames, | |||
2016 | Optional<bool> IsCaseSensitive, | |||
2017 | Optional<bool> IsOverlayRelative, | |||
2018 | StringRef OverlayDir) { | |||
2019 | using namespace llvm::sys; | |||
2020 | ||||
2021 | OS << "{\n" | |||
2022 | " 'version': 0,\n"; | |||
2023 | if (IsCaseSensitive.hasValue()) | |||
2024 | OS << " 'case-sensitive': '" | |||
2025 | << (IsCaseSensitive.getValue() ? "true" : "false") << "',\n"; | |||
2026 | if (UseExternalNames.hasValue()) | |||
2027 | OS << " 'use-external-names': '" | |||
2028 | << (UseExternalNames.getValue() ? "true" : "false") << "',\n"; | |||
2029 | bool UseOverlayRelative = false; | |||
2030 | if (IsOverlayRelative.hasValue()) { | |||
2031 | UseOverlayRelative = IsOverlayRelative.getValue(); | |||
2032 | OS << " 'overlay-relative': '" << (UseOverlayRelative ? "true" : "false") | |||
2033 | << "',\n"; | |||
2034 | } | |||
2035 | OS << " 'roots': [\n"; | |||
2036 | ||||
2037 | if (!Entries.empty()) { | |||
2038 | const YAMLVFSEntry &Entry = Entries.front(); | |||
2039 | ||||
2040 | startDirectory( | |||
2041 | Entry.IsDirectory ? Entry.VPath : path::parent_path(Entry.VPath) | |||
2042 | ); | |||
2043 | ||||
2044 | StringRef RPath = Entry.RPath; | |||
2045 | if (UseOverlayRelative) { | |||
2046 | unsigned OverlayDirLen = OverlayDir.size(); | |||
2047 | assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2048, __PRETTY_FUNCTION__)) | |||
2048 | "Overlay dir must be contained in RPath")((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2048, __PRETTY_FUNCTION__)); | |||
2049 | RPath = RPath.slice(OverlayDirLen, RPath.size()); | |||
2050 | } | |||
2051 | ||||
2052 | bool IsCurrentDirEmpty = true; | |||
2053 | if (!Entry.IsDirectory) { | |||
2054 | writeEntry(path::filename(Entry.VPath), RPath); | |||
2055 | IsCurrentDirEmpty = false; | |||
2056 | } | |||
2057 | ||||
2058 | for (const auto &Entry : Entries.slice(1)) { | |||
2059 | StringRef Dir = | |||
2060 | Entry.IsDirectory ? Entry.VPath : path::parent_path(Entry.VPath); | |||
2061 | if (Dir == DirStack.back()) { | |||
2062 | if (!IsCurrentDirEmpty) { | |||
2063 | OS << ",\n"; | |||
2064 | } | |||
2065 | } else { | |||
2066 | bool IsDirPoppedFromStack = false; | |||
2067 | while (!DirStack.empty() && !containedIn(DirStack.back(), Dir)) { | |||
2068 | OS << "\n"; | |||
2069 | endDirectory(); | |||
2070 | IsDirPoppedFromStack = true; | |||
2071 | } | |||
2072 | if (IsDirPoppedFromStack || !IsCurrentDirEmpty) { | |||
2073 | OS << ",\n"; | |||
2074 | } | |||
2075 | startDirectory(Dir); | |||
2076 | IsCurrentDirEmpty = true; | |||
2077 | } | |||
2078 | StringRef RPath = Entry.RPath; | |||
2079 | if (UseOverlayRelative) { | |||
2080 | unsigned OverlayDirLen = OverlayDir.size(); | |||
2081 | assert(RPath.substr(0, OverlayDirLen) == OverlayDir &&((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2082, __PRETTY_FUNCTION__)) | |||
2082 | "Overlay dir must be contained in RPath")((RPath.substr(0, OverlayDirLen) == OverlayDir && "Overlay dir must be contained in RPath" ) ? static_cast<void> (0) : __assert_fail ("RPath.substr(0, OverlayDirLen) == OverlayDir && \"Overlay dir must be contained in RPath\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2082, __PRETTY_FUNCTION__)); | |||
2083 | RPath = RPath.slice(OverlayDirLen, RPath.size()); | |||
2084 | } | |||
2085 | if (!Entry.IsDirectory) { | |||
2086 | writeEntry(path::filename(Entry.VPath), RPath); | |||
2087 | IsCurrentDirEmpty = false; | |||
2088 | } | |||
2089 | } | |||
2090 | ||||
2091 | while (!DirStack.empty()) { | |||
2092 | OS << "\n"; | |||
2093 | endDirectory(); | |||
2094 | } | |||
2095 | OS << "\n"; | |||
2096 | } | |||
2097 | ||||
2098 | OS << " ]\n" | |||
2099 | << "}\n"; | |||
2100 | } | |||
2101 | ||||
2102 | void YAMLVFSWriter::write(llvm::raw_ostream &OS) { | |||
2103 | llvm::sort(Mappings, [](const YAMLVFSEntry &LHS, const YAMLVFSEntry &RHS) { | |||
2104 | return LHS.VPath < RHS.VPath; | |||
2105 | }); | |||
2106 | ||||
2107 | JSONWriter(OS).write(Mappings, UseExternalNames, IsCaseSensitive, | |||
2108 | IsOverlayRelative, OverlayDir); | |||
2109 | } | |||
2110 | ||||
2111 | VFSFromYamlDirIterImpl::VFSFromYamlDirIterImpl( | |||
2112 | const Twine &_Path, | |||
2113 | RedirectingFileSystem::RedirectingDirectoryEntry::iterator Begin, | |||
2114 | RedirectingFileSystem::RedirectingDirectoryEntry::iterator End, | |||
2115 | bool IterateExternalFS, FileSystem &ExternalFS, std::error_code &EC) | |||
2116 | : Dir(_Path.str()), Current(Begin), End(End), | |||
2117 | IterateExternalFS(IterateExternalFS), ExternalFS(ExternalFS) { | |||
2118 | EC = incrementImpl(/*IsFirstTime=*/true); | |||
2119 | } | |||
2120 | ||||
2121 | std::error_code VFSFromYamlDirIterImpl::increment() { | |||
2122 | return incrementImpl(/*IsFirstTime=*/false); | |||
2123 | } | |||
2124 | ||||
2125 | std::error_code VFSFromYamlDirIterImpl::incrementExternal() { | |||
2126 | assert(!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) &&((!(IsExternalFSCurrent && ExternalDirIter == directory_iterator ()) && "incrementing past end") ? static_cast<void > (0) : __assert_fail ("!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2127, __PRETTY_FUNCTION__)) | |||
2127 | "incrementing past end")((!(IsExternalFSCurrent && ExternalDirIter == directory_iterator ()) && "incrementing past end") ? static_cast<void > (0) : __assert_fail ("!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2127, __PRETTY_FUNCTION__)); | |||
2128 | std::error_code EC; | |||
2129 | if (IsExternalFSCurrent) { | |||
2130 | ExternalDirIter.increment(EC); | |||
2131 | } else if (IterateExternalFS) { | |||
2132 | ExternalDirIter = ExternalFS.dir_begin(Dir, EC); | |||
2133 | IsExternalFSCurrent = true; | |||
2134 | if (EC && EC != errc::no_such_file_or_directory) | |||
2135 | return EC; | |||
2136 | EC = {}; | |||
2137 | } | |||
2138 | if (EC || ExternalDirIter == directory_iterator()) { | |||
2139 | CurrentEntry = directory_entry(); | |||
2140 | } else { | |||
2141 | CurrentEntry = *ExternalDirIter; | |||
2142 | } | |||
2143 | return EC; | |||
2144 | } | |||
2145 | ||||
2146 | std::error_code VFSFromYamlDirIterImpl::incrementContent(bool IsFirstTime) { | |||
2147 | assert((IsFirstTime || Current != End) && "cannot iterate past end")(((IsFirstTime || Current != End) && "cannot iterate past end" ) ? static_cast<void> (0) : __assert_fail ("(IsFirstTime || Current != End) && \"cannot iterate past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2147, __PRETTY_FUNCTION__)); | |||
2148 | if (!IsFirstTime) | |||
2149 | ++Current; | |||
2150 | while (Current != End) { | |||
2151 | SmallString<128> PathStr(Dir); | |||
2152 | llvm::sys::path::append(PathStr, (*Current)->getName()); | |||
2153 | sys::fs::file_type Type = sys::fs::file_type::type_unknown; | |||
2154 | switch ((*Current)->getKind()) { | |||
2155 | case RedirectingFileSystem::EK_Directory: | |||
2156 | Type = sys::fs::file_type::directory_file; | |||
2157 | break; | |||
2158 | case RedirectingFileSystem::EK_File: | |||
2159 | Type = sys::fs::file_type::regular_file; | |||
2160 | break; | |||
2161 | } | |||
2162 | CurrentEntry = directory_entry(std::string(PathStr.str()), Type); | |||
2163 | return {}; | |||
2164 | } | |||
2165 | return incrementExternal(); | |||
2166 | } | |||
2167 | ||||
2168 | std::error_code VFSFromYamlDirIterImpl::incrementImpl(bool IsFirstTime) { | |||
2169 | while (true) { | |||
2170 | std::error_code EC = IsExternalFSCurrent ? incrementExternal() | |||
2171 | : incrementContent(IsFirstTime); | |||
2172 | if (EC || CurrentEntry.path().empty()) | |||
2173 | return EC; | |||
2174 | StringRef Name = llvm::sys::path::filename(CurrentEntry.path()); | |||
2175 | if (SeenNames.insert(Name).second) | |||
2176 | return EC; // name not seen before | |||
2177 | } | |||
2178 | llvm_unreachable("returned above")::llvm::llvm_unreachable_internal("returned above", "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2178); | |||
2179 | } | |||
2180 | ||||
2181 | vfs::recursive_directory_iterator::recursive_directory_iterator( | |||
2182 | FileSystem &FS_, const Twine &Path, std::error_code &EC) | |||
2183 | : FS(&FS_) { | |||
2184 | directory_iterator I = FS->dir_begin(Path, EC); | |||
2185 | if (I != directory_iterator()) { | |||
2186 | State = std::make_shared<detail::RecDirIterState>(); | |||
2187 | State->Stack.push(I); | |||
2188 | } | |||
2189 | } | |||
2190 | ||||
2191 | vfs::recursive_directory_iterator & | |||
2192 | recursive_directory_iterator::increment(std::error_code &EC) { | |||
2193 | assert(FS && State && !State->Stack.empty() && "incrementing past end")((FS && State && !State->Stack.empty() && "incrementing past end") ? static_cast<void> (0) : __assert_fail ("FS && State && !State->Stack.empty() && \"incrementing past end\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2193, __PRETTY_FUNCTION__)); | |||
2194 | assert(!State->Stack.top()->path().empty() && "non-canonical end iterator")((!State->Stack.top()->path().empty() && "non-canonical end iterator" ) ? static_cast<void> (0) : __assert_fail ("!State->Stack.top()->path().empty() && \"non-canonical end iterator\"" , "/build/llvm-toolchain-snapshot-12~++20201208100613+51f3432f4b5/llvm/lib/Support/VirtualFileSystem.cpp" , 2194, __PRETTY_FUNCTION__)); | |||
2195 | vfs::directory_iterator End; | |||
2196 | ||||
2197 | if (State->HasNoPushRequest) | |||
2198 | State->HasNoPushRequest = false; | |||
2199 | else { | |||
2200 | if (State->Stack.top()->type() == sys::fs::file_type::directory_file) { | |||
2201 | vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC); | |||
2202 | if (I != End) { | |||
2203 | State->Stack.push(I); | |||
2204 | return *this; | |||
2205 | } | |||
2206 | } | |||
2207 | } | |||
2208 | ||||
2209 | while (!State->Stack.empty() && State->Stack.top().increment(EC) == End) | |||
2210 | State->Stack.pop(); | |||
2211 | ||||
2212 | if (State->Stack.empty()) | |||
2213 | State.reset(); // end iterator | |||
2214 | ||||
2215 | return *this; | |||
2216 | } |